Which statement correctly describes the Central Processing Unit?

• A. It executes instructions and performs calculations
• B. It stores long-term data
• C. It manages I/O devices exclusively
• D. It renders graphics

Answer: (A)

The CPU runs programs by fetching, decoding, and executing instructions, performing the calculations those instructions require. It contains the control unit that coordinates operations and the arithmetic logic unit that handles arithmetic and logical tasks. Long-term data storage is provided by memory and storage devices, not by the CPU itself. While the CPU can influence I/O operations, it doesn’t exclusively manage all I/O hardware, which relies on controllers and drivers. Graphics rendering is primarily handled by the GPU, with the CPU often preparing data for it rather than rendering directly. So, describing the CPU as executing instructions and performing calculations captures its main role.