What is the function of the cache memory in a computer's memory hierarchy?

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**Solution:**

1. Cache memory is a small, high-speed memory located close to the CPU.

2. Its primary function is to store frequently accessed data and instructions to allow the CPU to retrieve them faster than from main memory.

3. It is volatile memory and does not provide permanent storage, so option 1 is incorrect.

4. The control of data flow between CPU and memory is managed by the memory controller, not cache memory, so option 3 is incorrect.

5. Memory allocation to different programs is handled by the operating system, not cache memory, so option 4 is incorrect.

**Answer:** To store frequently used data for faster access by the CPU.

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