Final answer:
The CPU, or Central Processing Unit, is considered a Control device because it manages and controls the operations and execution of programs within the computer.
Step-by-step explanation:
The CPU or Central Processing Unit is known as the brain of the computer. It is responsible for executing instructions and processing data. In the context of the options provided, the CPU would be classified as a Control device. This is because it manages the operations of the computer by controlling the execution of programs, and it directs the function of all the other units within the computer.