Which one of the following is termed a combination input-output device?

The correct answer is: A. VDT

A VDT (Visual Display Terminal) is a combination input-output device because it allows users to input data (e.g., by typing on the keyboard) and view output (e.g., text or images on the screen).

A keyboard is an input device that allows users to enter text into a computer.

A printer is an output device that allows users to print text or images from a computer.

A laser jet is a type of printer that uses a laser to create an image on a drum, which is then transferred to paper.

None of the above options are combination input-output devices.