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Which of the following must be true for the RFE (Return from Exception) instruction on a general purpose processor? I. It must be a trap instruction II. It must be a privileged instruction III. An exception cannot be allowed to occur during execution of an RFE instruction

1. I only
2. II only
3. I and II only
4. I, II and III only

Correct answer: I, II and III only

Solution

The RFE instruction is designed to safely return from an exception, which necessitates it being a trap and privileged instruction to ensure proper control over the execution environment. Additionally, preventing exceptions during its execution is crucial to maintain system stability and integrity.

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