Total types of data that can be read by document reader are

Answer Details

A document reader is an input device built to capture information directly from paper documents and convert it into digital data the computer can process. Different document readers are designed to recognise different kinds of marks and text on a page.

Optical mark readers detect marks, such as shaded boxes on a multiple-choice answer sheet. Optical character recognition readers can interpret both handwritten and printed characters. Optical line readers can scan printed lines of text or barcodes. Because each of these is a genuine, distinct type of data that document readers are built to capture, the complete and accurate answer covers all of them together.

Choosing only marks, only handwritten and printed characters, or only printed lines would each describe just one category of document reader rather than the full range of data types that document readers, as a class of device, are capable of reading.

Examination reminder: when a question lists several genuine sub-types of the same device or concept and then offers "all of the above", check first whether every individual option is factually correct before selecting the combined choice.