Computer Monitor is also known as

Older technical terminology for computer monitors comes from television and display technology, where the screen was described by what it physically does: it visually displays information to the user.

VDU stands for Visual Display Unit, a term used to describe the screen and its associated circuitry that shows text, images, and graphical output from a computer. The term predates the widespread use of the word "monitor" and is still found in older textbooks, technical manuals, and some examination syllabuses.

The remaining choices are simply scrambled or incorrect letter arrangements of the same abbreviation, and "CCTV" refers to closed-circuit television, a surveillance camera system, which has nothing to do with displaying computer output.

Examination reminder: when a question uses older technical vocabulary, remember that VDU (Visual Display Unit) and "monitor" refer to the same device.