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Answer:

The computer's central processing unit (CPU) is the portion of a computer that retrieves and executes instructions. The CPU is essentially the brain of a CAD system. It consists of an arithmetic and logic unit (ALU), a control unit, and various registers.

Explanation:

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CPU stands for central processing unit and it is pretty much what processes most things you do on a computer also make sure to never get this confused with a GPU as they are both different