Explanation:

- Status Register (Option 2)

- The status register holds flags that show the outcomes of arithmetic and logical operations. It includes flags like carry, overflow, negative, and zero.

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- Stack Register (Option 1)

- This register is used to manage function calls and local variables, not to store operation results.

- Memory Data Register (Option 3)

- It doesn’t hold flags but temporarily stores data being transferred to/from memory.

- Memory Buffer

- This is another name for the Memory Data Register, so it has the same role and doesn’t store any status flags.