ANS:C - Visual display terminal

Visual display terminal most popular input device used today for interactive processing & for the on line entry of data for batch processing.

A video display unit (VDU) consists of: A computer output device that uses a cathode ray tube or other technology to present visual images. One or more input devices, such as a keyboard, a mouse, or both. A synonym sometimes used in the United States is video display terminal (VDT).