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Question 1 Report
What is a computer file.
Answer Details
A computer file is a place on a computer where information is stored in a package. A file can contain many different types of information, including text, images, audio, video, and executable programs. The information in a file is organized in a specific format, and the file can be opened and edited using appropriate software. For example, a text file contains plain text, while a Word document file contains formatted text and other elements like images and tables. A file is often saved with a specific name and extension that identifies the type of file and the type of information it contains. The extension is the part of the file name that comes after the dot, such as ".txt" for a plain text file or ".docx" for a Microsoft Word document file.
Question 2 Report
What does CO stand for in COBOL?
Answer Details
In COBOL, CO stands for "Common Business Oriented Language". COBOL is a programming language that was designed specifically for business applications, such as finance, accounting, and payroll. COBOL was first developed in the late 1950s, and it quickly became popular in the business world because it was easy to use and understand, and it could handle large amounts of data. The "common" part of the acronym refers to the fact that COBOL was intended to be a language that could be used by a wide range of businesses, regardless of their specific industry or application. The "business-oriented" part of the acronym emphasizes the language's focus on business data and processing.
Question 3 Report
Computer applications are example of ___________
Answer Details
Computer applications are an example of software. Software refers to the programs, data, and instructions that tell a computer what to do and how to do it. Computer applications are specific types of software that are designed to perform particular tasks or solve particular problems. Examples of computer applications include web browsers, word processors, email clients, and games. Computer applications are different from computer hardware, which refers to the physical components of a computer, such as the processor, memory, and storage devices. Computer utilities and program packages are different types of software that can be used to manage and maintain a computer system, but they are not the same as computer applications, which are designed for specific tasks and are often used by end-users. In summary, computer applications are a type of software, which refers to the programs, data, and instructions that tell a computer what to do and how to do it. Computer applications are designed to perform specific tasks or solve specific problems, and examples include web browsers, word processors, email clients, and games.
Question 4 Report
Which of the following is a computer not used for?
Answer Details
A computer can be used for entertainment, information, and social media, so the answer is "none of the above". Computers are versatile machines that can perform a wide variety of tasks, including playing games, streaming videos, accessing news and other information, and connecting with others on social media platforms. While some computers may be designed or optimized for certain types of tasks, such as gaming or video editing, all computers are capable of handling entertainment, information, and social media to some extent. Therefore, the answer to this question is that there is no option that describes something a computer cannot be used for among the given choices.
Question 5 Report
.......... provides total solutions to reduce data redundancy, inconsistency, dependence and unauthorized access of data
Answer Details
A DBMS (Database Management System) provides comprehensive solutions to reduce data redundancy, inconsistency, dependence, and unauthorized access of data. Data redundancy refers to the duplication of data in a database, which can lead to inconsistencies and take up unnecessary storage space. A DBMS helps to eliminate data redundancy by ensuring that each piece of data is stored only once and is consistently maintained. Data inconsistency refers to the occurrence of conflicting data in a database, which can lead to problems when trying to make decisions based on the data. A DBMS helps to maintain data consistency by enforcing constraints and rules that ensure that data is entered consistently and accurately. Data dependence refers to the relationship between different pieces of data in a database. A DBMS helps to reduce data dependence by allowing data to be stored in separate tables and establishing relationships between those tables. This reduces the risk of changes in one table affecting the data in another table. Finally, a DBMS provides security features to prevent unauthorized access to the data stored in the database. This includes controlling access to the database through user authentication and authorization, as well as ensuring that sensitive data is encrypted to protect it from being accessed by unauthorized individuals. In short, a DBMS provides a centralized and organized way to store, manage, and secure data to ensure its accuracy, consistency, and security.
Question 6 Report
The most basic network is _________
Answer Details
The most basic network is a Personal Area Network or PAN. A PAN is a network that connects devices located within a relatively small area, typically within a person's personal space. This can include devices like smartphones, tablets, laptops, and other wearable devices. A PAN can be created using different types of technologies like Bluetooth or Wi-Fi, which allow devices to communicate with each other and share resources such as files, internet connection, and printers, among others. For example, if you have a smartphone and a wireless headset, you can create a PAN by connecting your phone to the headset via Bluetooth. This allows you to make and receive phone calls hands-free. In summary, a PAN is the most basic network as it connects devices within a small personal area and is easy to set up and use. It is the foundation upon which larger and more complex networks like LAN, WAN, and MAN are built.
Question 7 Report
The combination of the arithmetic and logic units, as well as the ______________ unit makes up the central processing unit.
Answer Details
The combination of the arithmetic and logic units, as well as the control unit makes up the central processing unit (CPU). A CPU is the "brain" of a computer. It is responsible for executing instructions and performing calculations. The arithmetic and logic units (ALU) are the parts of the CPU that perform mathematical operations, such as addition, subtraction, multiplication, and division, as well as logical operations, such as AND, OR, and NOT. The control unit is responsible for controlling the flow of data and instructions within the CPU and between the CPU and other parts of the computer, such as memory and input/output devices. It fetches instructions from memory, decodes them to determine what operation to perform, and then directs the ALU to perform the operation. In summary, the combination of the ALU and control unit makes up the CPU, which is responsible for processing data and instructions and performing calculations in a computer.
Question 8 Report
Computer software can be classified into how many parts?
Answer Details
Computer software can be classified into two main parts: system software and application software. 1. System software: This type of software includes the programs that control the hardware components of a computer system and provide a platform for running other software applications. Examples of system software include operating systems, device drivers, utility programs, and firmware. 2. Application software: This type of software is designed to perform specific tasks or functions for the user. Application software can be further classified into two subcategories: general-purpose applications and specialized applications. Examples of general-purpose applications include word processors, spreadsheets, and web browsers, while examples of specialized applications include graphics software, database software, and video editing software. In summary, computer software can be classified into two main parts: system software and application software. The system software controls the hardware and provides a platform for running other software applications, while application software is designed to perform specific tasks or functions for the user.
Question 9 Report
Which type of network can span several building, but is usually less than 30 square miles big?
Answer Details
The type of network that can span several buildings but is usually less than 30 square miles big is called a MAN (Metropolitan Area Network). A MAN is a network that covers a larger geographical area than a LAN (Local Area Network) but is smaller than a WAN (Wide Area Network). It typically spans across a city or a town, connecting various LANs within its area. MANs are designed to provide high-speed connectivity between different locations within a metropolitan area, allowing users to share resources and information. They can be owned and managed by a single organization or shared by multiple organizations, such as service providers or government agencies. Some examples of MAN technologies include Fiber Distributed Data Interface (FDDI), Asynchronous Transfer Mode (ATM), and Ethernet.
Question 10 Report
___________ is the combination of already processed _____________
Answer Details
Information is the combination of already processed data. Data refers to raw, unprocessed facts and figures. For example, a list of numbers or a set of survey answers are data. Information is created when data is processed, organized, and given meaning. For example, taking the average of the numbers in the list would turn the data into meaningful information.
Question 11 Report
The illegal access to a network or computer system is___________
Answer Details
The illegal access to a network or computer system is called hacking. Hacking refers to unauthorized access to a computer system or network with the intention of compromising its security and potentially causing harm. This can include stealing sensitive information, installing malicious software, or disrupting the normal functioning of the system. Hacking is illegal and can result in serious consequences for the hacker, such as fines and imprisonment. It is important for individuals and organizations to take steps to secure their networks and systems to prevent unauthorized access.
Question 12 Report
Which of the following is not a type of logic gate
Answer Details
The option that is not a type of logic gate is "DOR" because it is not a commonly used logic gate in digital electronics. Logic gates are the building blocks of digital circuits, and they perform basic logical operations on input signals to generate output signals. The three most commonly used types of logic gates are XOR, OR, and AND. XOR (exclusive OR) gate generates a high output only when the inputs are different, and a low output when they are the same. It is commonly used in digital communication systems and encryption algorithms. OR gate generates a high output if any of its inputs are high, and a low output if all of its inputs are low. It is used to combine multiple input signals in digital circuits. AND gate generates a high output only when all of its inputs are high, and a low output if any of its inputs are low. It is used to implement logical conjunction (AND) in digital circuits. In summary, DOR is not a type of logic gate because it is not commonly used in digital electronics. The commonly used types of logic gates are XOR, OR, and AND.
Question 13 Report
In which situation does running application remain active?
Answer Details
When a computer application is running, it is stored in the computer's memory, which allows it to continue functioning as long as it is needed. In the case of logging off, shutting down, or rebooting the computer, all applications currently running on the system are closed or terminated. Therefore, the running application would not remain active in any of these situations. However, in the case of a user switching, the running application can remain active. This is because when a user switches on a computer that is running, the operating system creates a new user session while keeping the current user's session active. In this scenario, the running application would continue to function within the current user's session, while the new user session would be independent and have its own set of applications and processes. Therefore, the running application would remain active when the user is switched.
Question 14 Report
The first commuters were programed using _________
Answer Details
The first commuters were programmed using machine language. Machine language is the lowest-level programming language that can be used to write computer programs. It consists of binary code, which is a sequence of 1's and 0's that the computer can understand and execute directly. The first computers, such as the ENIAC, did not have high-level programming languages like we have today, such as Python or Java. Instead, they had to be programmed using machine language. This meant that the programmers had to manually enter long sequences of binary code to perform even the simplest tasks on the computer. As computers advanced, higher-level programming languages were developed to make programming easier and more accessible to non-experts. These higher-level languages are often compiled into machine language, which the computer can then execute. But in the early days of computing, programmers had no choice but to write code directly in machine language.
Question 15 Report
What is the major purpose of application software?
Answer Details
The major purpose of application software is to help people perform specific tasks. It provides user-friendly interface to interact with computer systems and accomplish tasks such as word processing, creating spreadsheets, managing databases, playing games, and much more. In short, it is designed to make the user's work easier and more efficient, allowing them to accomplish their work goals with the help of the computer.
Question 16 Report
A word processor can be used to
Answer Details
A word processor is a computer program that is used to create, edit, and print text documents. With a word processor, you can type in text, make changes to it, format it with different fonts and styles, and then print it out if you need a hard copy. In short, a word processor allows you to write, edit, and print text in a convenient and flexible way.
Question 17 Report
Which of the following system software resides in the main memory always?
Answer Details
The system software that always resides in the main memory is the Operating System (OS). In many operating systems, the loader resides permanently in memory. The OS manages the resources of the computer and acts as an interface between the user and the hardware. It is responsible for tasks such as memory management, process management, file management, and input/output operations. Text editors, assemblers, linkers, and loaders are all types of system software, but they do not always reside in the main memory. They are typically loaded into memory when needed, and can be swapped out of memory when other processes need more memory. This is because main memory is a limited resource and the OS dynamically allocates it to different processes as needed.
Question 18 Report
What does RAM and ROM have in common?
Answer Details
The first option, "They both deal with memory," is correct. RAM and ROM are both types of memory used in computers and other electronic devices. RAM (Random Access Memory) is a type of volatile memory that stores data temporarily and is used for running programs and applications. When the power is turned off, the data stored in RAM is lost. ROM (Read-Only Memory) is a type of non-volatile memory that stores data permanently and is used for storing the basic input/output system (BIOS) that helps to boot up the computer. The data stored in ROM cannot be easily altered or deleted. In summary, both RAM and ROM are types of memory used in electronic devices, and they both deal with storing and accessing data.
Question 19 Report
he binary system has the radix of ________
Answer Details
The binary system has a radix of 2. The radix of a number system is the number of unique digits used in that system. For example, in the decimal system (base 10), the radix is 10, because we use 10 unique digits (0 to 9) to represent numbers. In the binary system (base 2), the radix is 2, because we only use 2 unique digits: 0 and 1. This means that every number can be represented as a combination of only 0s and 1s in the binary system.
Question 20 Report
The memory unit receives data and information from which unit?
Question 21 Report
________ is the process of dividing the disk into tracks and sectors
Answer Details
The process of dividing a disk into tracks and sectors is called "formatting". Formatting prepares a new disk for use by creating a file system that can store and organize data. Tracks are circular paths on the disk, and sectors are small sections within each track. By dividing the disk into tracks and sectors, formatting allows the operating system to efficiently read and write data to the disk. Think of it like drawing lines on a blank piece of paper to create a grid. The grid allows you to organize your content and write in an orderly manner. Similarly, formatting divides the disk into a grid-like structure that the computer can use to organize and store data.
Question 22 Report
Computers are used majorly at offices for ____________
Answer Details
Computers are commonly used in offices for a variety of tasks, but some of the major purposes include: 1. Creating and editing documents: Computers are used to create and edit documents such as letters, reports, presentations, and spreadsheets. This is because computers offer a range of software applications that allow users to create and edit documents easily and quickly. 2. Communication: Computers are used to communicate with other employees, clients, and customers through email, video conferencing, and instant messaging. 3. Data management: Computers are used to store and manage data such as customer information, financial records, and inventory lists. This is because computers offer software that allows users to organize and track data efficiently. 4. Accounting: Computers are used for accounting purposes such as bookkeeping, payroll, and invoicing. This is because computers offer specialized software that allows users to manage financial data accurately and quickly. 5. Security: Computers are also used for security purposes such as monitoring and controlling access to sensitive data and systems. This is because computers offer software and hardware tools that can be used to safeguard against unauthorized access and cyber threats. Overall, computers have become an essential tool in the modern office environment, enabling employees to work more efficiently, communicate more effectively, and manage data and information more securely.
Question 23 Report
Microsoft word serves the purpose of ________
Answer Details
Microsoft Word serves the purpose of creating documents, which can be anything from simple letters or memos to complex reports, resumes, or even books. It provides a user-friendly platform for users to write, edit, format, and style text, as well as insert images, tables, and other elements to enhance the document's appearance and functionality. Microsoft Word is a popular word processing software used in a wide range of industries, including education, business, and personal use. It allows users to save their documents on their computer or in the cloud, making it easy to access, edit, and share their work from anywhere. Overall, Microsoft Word is a powerful tool for anyone who needs to create or manage written content.
Question 24 Report
Which among the following generation computers had expensive operation cost?
Answer Details
The second generation of computers had expensive operation costs compared to other generations. The second generation of computers, which emerged in the late 1950s and early 1960s, were characterized by the use of transistors instead of vacuum tubes that were used in the first generation. While transistors were smaller, more reliable, and more energy-efficient than vacuum tubes, they were still relatively expensive to produce and required a significant amount of power to operate. In addition, the second generation of computers required air conditioning systems to keep them cool, which added to their overall operating costs. The high cost of production, maintenance, and operation made these computers expensive and limited their accessibility to only large organizations, such as government agencies, research institutions, and corporations, which had the resources to invest in them. In contrast, the third and fourth generations of computers, which emerged in the 1960s and 1970s, respectively, were characterized by the use of integrated circuits and microprocessors, which greatly reduced the cost of production and operation, making computers more accessible and affordable to individuals and small businesses.
Question 25 Report
In Microsoft Excel, sheet tabs can be renamed by ______
Answer Details
Sheet tabs in Microsoft Excel can be renamed by double-clicking on the sheet tab and entering the new name. To do this, simply click on the sheet tab that you want to rename and wait for it to become active. Then, double-click on the tab, and the name will become editable. Type in the new name you want for the sheet and press the Enter key or click outside the tab to save the changes.
Question 26 Report
Which of the below-mentioned reasons do not satisfy the reason why people create a computer virus?
Answer Details
The reason "protection" does not satisfy why people create a computer virus. This is because a computer virus is not created to protect a system or its data, but rather to cause harm to it by spreading and infecting other systems. Creating a virus goes against the goal of protecting a computer system, and instead puts it at risk.
Question 27 Report
How are the stages of SDLC implemented?
Answer Details
SDLC, or Software Development Life Cycle, is the process of developing software from the initial planning phase to the final deployment phase. The different stages of SDLC are implemented in various ways, depending on the project requirements and the development team's preferences. Let's take a look at each option: 1. Randomly, without overlapping: Implementing the stages of SDLC randomly and without overlapping is not an ideal approach as it can lead to confusion and delays. This method involves starting and completing stages without considering their interdependencies or the requirements of the subsequent stages. It can also result in rework and revisions of previous stages, causing unnecessary delays and additional costs. 2. Sequentially, without overlapping: This is the most common way of implementing the stages of SDLC. In this approach, each stage is completed sequentially, with no overlapping or parallel work being done. This method ensures that each stage is completed before moving onto the next, ensuring that all the requirements and objectives of each stage are met. It also reduces the risk of errors and makes it easier to track progress. 3. Sequentially with overlapping: In this approach, the stages of SDLC are completed sequentially, but with some overlapping. This means that the team may start work on the next stage before completing the current stage. This approach can help reduce the overall project timeline by minimizing the wait time between stages. However, it requires careful planning and coordination to ensure that the overlapping does not create confusion or conflict. 4. Randomly with overlapping: Implementing the stages of SDLC randomly with overlapping is the least recommended approach. This method involves starting and completing stages randomly and with some overlapping. This approach can lead to confusion, delays, and increased costs, as well as making it difficult to track progress and ensure that all requirements are met. In summary, implementing the stages of SDLC sequentially, without overlapping is the most common and recommended approach. This ensures that each stage is completed before moving onto the next, while also minimizing the project timeline.
Question 28 Report
Which of the following is not a stage of system development cycle?
Answer Details
The stage of system development cycle that is not commonly considered is "Observation". The typical stages of the system development cycle are planning, analysis, design, implementation, and testing. During the planning stage, the requirements and objectives of the system are identified. In the analysis stage, the requirements are studied in detail, and the feasibility of the system is determined. The design stage involves creating a blueprint for the system, including its architecture, interfaces, and data structures. During implementation, the system is built and the design is turned into a working system. Testing involves checking the system's performance and identifying any errors or bugs that need to be fixed. Observation is not usually considered a distinct stage in the system development cycle, but it can be seen as a part of testing or implementation. Observation involves monitoring the system after it has been implemented to ensure that it is working as intended and to identify any issues that need to be addressed.
Question 29 Report
Another word for booting is
Answer Details
Another word for booting is "starting". Booting refers to the process of turning on a computer or device and initiating the operating system so that it is ready to run applications and perform other tasks. During the boot process, the computer performs a series of operations, such as checking hardware components, initializing software, and loading system files into memory. Once this process is complete, the computer is considered "started" and the user can begin using it. Therefore, starting is an appropriate alternative term for booting.
Question 30 Report
___________________ is a program meant to be sent from one computer to another across the world wide Web.
Question 31 Report
Computer softwares like ios, Ubuntu, Chrome OS, are classified as ___________
Answer Details
Computer softwares like iOS, Ubuntu, Chrome OS are classified as operating systems, also known as system software. An operating system is a type of software that acts as the backbone of a computer, managing its resources and allowing other software to run on it. It controls the hardware, such as the CPU, memory, and storage, and provides a platform for other software to run on. This includes basic functions like managing files, running applications, and providing access to the internet. In short, the operating system is what makes a computer work and provides a foundation for other software to run on.
Question 32 Report
Which of the memories must be refreshed many times per second?
Answer Details
Out of the given options, Dynamic RAM (DRAM) must be refreshed many times per second. DRAM is a type of computer memory that stores data in a capacitor within each memory cell. The capacitor can hold a charge, representing either a 0 or 1, but it gradually leaks over time, meaning that the data will eventually fade away. To prevent this data loss, the memory controller sends a refresh command to the DRAM chip many times per second. This refresh command recharges the capacitors in the memory cells to maintain the data stored in them. In contrast, Static RAM (SRAM) does not require refreshing, as it uses a different type of storage element that does not leak charge like a capacitor. EPROM and ROM are non-volatile memory types, meaning that they retain data even without power, and do not require refreshing.
Question 33 Report
Which of the following isn't used to navigate in a computer?
Answer Details
The option that is not used to navigate in a computer is the scanner. A scanner is a device used to convert physical documents and images into digital format so that they can be stored and processed on a computer. It is not used to navigate a computer, but rather to input physical content into it. On the other hand, the cursor, keyboard, and mouse are all used for navigating a computer. The cursor, typically controlled by a mouse, touchpad or trackpad, allows you to select items and move around the screen. The keyboard is used to input text and commands, and the mouse is used to click and drag items on the screen. So in summary, the scanner is not used for navigating a computer, whereas the cursor, keyboard, and mouse are commonly used for this purpose.
Question 34 Report
Files that maintain the hierarchical structure of the file system.
Answer Details
The correct answer is "Directories." Directories are special files that organize the hierarchical structure of the file system by grouping related files together into named collections. They act like folders, allowing users to easily locate and access the files they need. Each directory can contain other directories (sub-directories) and files. For example, in a Windows system, the "C:\Users" directory contains a sub-directory for each user account on the computer, and each user account directory contains sub-directories for documents, pictures, music, etc. In short, directories allow us to maintain a structured and organized file system.
Question 35 Report
Which is not a network for distribution of information?
Answer Details
Microsoft Word is not a network for the distribution of information. Microsoft Word is a word processing software that is used to create, edit, and format documents. It is not a network because it does not distribute information, it is used to create and store information on a single device or in a cloud storage service. On the other hand, cloud storage, several computers to one printer, and e-mail are all examples of networks that distribute information.
Question 36 Report
Which key deletes text?
Answer Details
The key that deletes text is the backspace key. When you type, the characters you enter are added to the right of the cursor, which shows you where the next character will be inserted. If you want to delete a character, you can move the cursor to the left of that character using the arrow keys, and then press the backspace key. This will remove the character to the left of the cursor. You can also use the backspace key to delete a selection of text. To do this, you first need to highlight the text you want to delete by clicking and dragging the cursor over it. Once the text is highlighted, you can press the backspace key to delete it. In summary, the backspace key is used to delete characters to the left of the cursor or to delete a selected portion of text.
Question 37 Report
Which doesn't belong to the group?
Answer Details
The option that does not belong to the group is "External memory". Primary memory, main memory, and internal memory are all types of memory that are directly accessible by the CPU (Central Processing Unit) of a computer. These types of memory are volatile, which means that they lose their data when the power is turned off. Primary memory is the smallest and fastest type of memory in a computer, and it includes the cache and registers. Main memory, also known as RAM (Random Access Memory), is the largest type of primary memory in a computer and holds the data and instructions that the CPU needs to access quickly. Internal memory refers to the storage capacity that is built into a device, such as a hard drive or a solid-state drive (SSD). This type of memory is non-volatile, which means that it retains its data even when the power is turned off. External memory, on the other hand, refers to any type of storage that is external to the device, such as a USB flash drive, an external hard drive, or a cloud-based storage service. While external memory can be used to store data, it is not considered to be a type of primary or internal memory because it is not directly accessible by the CPU. Instead, data must be transferred between external memory and primary or internal memory before it can be accessed by the CPU.
Question 38 Report
What is the full form of TCP?
Answer Details
The full form of TCP is Transmission Control Protocol. TCP is a communication protocol that is used to send and receive data over the internet. It is one of the main protocols in the Internet Protocol Suite (commonly referred to as TCP/IP), which is the set of rules and standards that govern how data is transmitted on the internet. TCP provides a reliable, ordered, and error-checked delivery of data between applications running on different devices. It breaks down the data into small packets, and each packet is numbered and tracked to ensure that it arrives at its destination in the correct order and without errors. If a packet is lost or damaged during transmission, TCP detects the error and retransmits the missing or damaged packet. TCP is widely used for sending and receiving data between web servers and web browsers, and for many other applications that require reliable and error-free data transmission over the internet.
Question 39 Report
What does LAN stand for?
Answer Details
LAN stands for "Local Area Network". A Local Area Network (LAN) is a computer network that connects devices in a relatively small area, such as a single building or a group of adjacent buildings. A LAN is used for sharing resources, such as printers, files, and internet connections, among the connected devices. Typically, a LAN is set up using Ethernet cables or Wi-Fi connections, and it may include a router, switch or hub to manage the flow of data between the connected devices. A LAN can be used in a variety of settings, including homes, schools, and businesses, where it can provide a more efficient way of sharing resources and communicating between devices. In summary, LAN stands for "Local Area Network", which is a computer network that connects devices in a small area, such as a building or group of buildings, and is used for sharing resources among the connected devices.
Question 40 Report
From where can the name of a user account be changed?
Answer Details
The name of a user account can be changed from the Control Panel in most operating systems, including Windows and macOS. In Windows, you can access the Control Panel by clicking on the Start menu and selecting "Control Panel" from the list of options. Once in the Control Panel, you can navigate to the "User Accounts" section and select the user account whose name you want to change. From there, you can click on the "Change your account name" option and enter the new name for the account. Similarly, in macOS, you can access the System Preferences by clicking on the Apple menu and selecting "System Preferences" from the list of options. Once in the System Preferences, you can navigate to the "Users & Groups" section and select the user account whose name you want to change. From there, you can click on the "Full Name" field and enter the new name for the account. In summary, the name of a user account can be changed from the Control Panel or System Preferences of your operating system. The exact steps to do so may vary slightly depending on the operating system, but in general, you can navigate to the "User Accounts" or "Users & Groups" section and select the account whose name you want to change.
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