Discussion
The correct sequence of steps for instruction execution is :
Answer: C
The correct sequence is opcode fetch, decode, execute.
The processor first fetches the opcode from the memory location held in the program counter and places it in the instruction register. It then decodes it to work out what operation is required and what operands are needed, and finally executes it, which may involve further memory reads or writes.
An instruction cannot be decoded or executed before it has been fetched, so every sequence that starts with decode or execute is impossible.
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