Explanation:

- The Control Unit (CU) is the correct answer. It fetches instructions from memory, decodes them, and orchestrates the CPU’s operations to execute them.

- ALU (Arithmetic Logic Unit): It performs arithmetic and logic operations but doesn’t handle instruction fetching or decoding.

- Cache Memory: This speeds up data access but doesn’t fetch or decode instructions itself.

- RAM (Random Access Memory): It stores data and instructions temporarily but doesn’t process or decode them.

- Registers: These are small storage locations within the CPU used for quick data access but not for instruction fetching or decoding.

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