The instruction that is not to be executed immediately is placed in the ______.

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**Solution:**

1. The **Instruction Buffer Register (IBR)** holds instructions fetched from memory that are not to be executed immediately. This allows the processor to pre-fetch instructions and store them temporarily.

2. The **Current Instruction Register (CIR)** holds the instruction currently being executed, so it is for immediate execution.

3. The **Memory Address Register (MAR)** holds the address of the memory location to be accessed, not the instruction itself.

4. The **Program Counter (PC)** holds the address of the next instruction to be fetched, not the instruction itself.

**Answer:** Instruction Buffer Register (IBR)

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