Concept:The monitor is the screen component of a computer system.
It is formally known as a Visual Display Unit.
Explanation:A computer monitor receives processed data from the system unit and presents it visually to the user.
It is an output device because it shows the results of processing.
The common abbreviation for Visual Display Unit is VDU.
Among the given options, only VDU correctly names the computer monitor.
Options A, B, and D are not standard terms for a monitor.
Answer:C. VDU