Concept:A monochrome monitor shows a single foreground colour against a contrasting background, so it effectively displays only two colours.
Explanation:A monochrome monitor is a CRT computer monitor that was widely used from the 1960s through the 1980s, before colour monitors became popular.
It is designed to display information in only one colour, such as green, amber, or white.
This foreground colour appears on a background, usually black, or sometimes white.
Because it combines one display colour with one background colour, the monitor shows just two colours in total.
Colour monitors and colour graphic adapters (CGA) are built to produce many different colours, so they do not match the description.
Although "dichrome" literally suggests two colours, it is not the standard term used for such monitors in computing studies.
For exam purposes, the monitor that shows only two colours is best identified as a monochrome monitor.
Answer:D. monochrome monitor