An operating system is the most important software that runs on a computer. It manages the computer's memory and processes, as well as all of its software and hardware. It also allows you to communicate with the computer without knowing how to speak the computer's language.
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The answer is D) Projector because with a projector, its in the name project so it can anything u put on their, and put it on a virtual screen that can be put on a wall, so everyone can see.