The ALU of a computer responds to the commands coming fromOption A:Cache memoryOption B:External memoryOption C:Primary memoryOption D:Control Unit

Breakdown of the Problem

To determine what component the ALU (Arithmetic Logic Unit) responds to, we need to understand the roles of the various options provided.

Relevant Concepts

1. ALU (Arithmetic Logic Unit): A component of a computer that performs arithmetic and logical operations.
2. Cache Memory: A small-sized type of volatile computer memory that provides high-speed data access to the processor and stores frequently used program instructions and data.
3. External Memory: Refers to memory that is not directly accessible from the CPU, such as hard drives and SSDs.
4. Primary Memory: Also known as main memory or RAM, it is directly accessible by the CPU.
5. Control Unit: A component of the CPU that directs the operation of the processor and tells the ALU what operations to perform.

Analysis and Detail

• Cache Memory: While it speeds up data access, it doesn't directly issue commands to the ALU.
• External Memory: Provides storage but does not communicate directly with the ALU.
• Primary Memory: Stores data that can be used by the ALU, but it doesn't send commands.
• Control Unit: This is crucial, as it sends command signals to the ALU for executing operations.

Verify and Summarize

Among the provided options, the Control Unit is responsible for directing the ALU, making it the correct answer.

Final Answer

The ALU of a computer responds to Option D: Control Unit.