Computer virus cannot be transmitted by

Computer viruses can be transmitted through downloading files, e-mail attachments, and pen drives. However, computer viruses cannot be transmitted by typing on a keyboard. A computer virus is a type of malicious software that can replicate itself and spread to other computers or devices. Computer viruses can be transmitted through various means, such as infected files, e-mail attachments, or removable media like pen drives or USB drives. However, typing on a keyboard does not involve the transmission or exchange of any files or data that could carry a computer virus. While a computer virus can infect a computer through a keyboard input, such as downloading a malicious file or visiting an infected website, the actual act of typing on a keyboard does not transmit a virus on its own. In summary, computer viruses can be transmitted through downloading files, e-mail attachments, and pen drives, but not through typing on a keyboard. It's important to be careful and cautious when downloading files or opening attachments to prevent the spread of computer viruses.