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A. Hard disk
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B. CPU
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C. Key Board
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D. None of these
Explanation
The principal component of the CPU is the Arithmetic Logic Unit and Control Unit.
ALU stands for Arithmetic and Logical Unit which performs Arithmetic functions like Addition, subtraction, division, etc.
CU stands for control unit which performs the task of controlling functions of the computer.
It monitors and gives proper instructions to all parts of the computer.
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