Q
The undo and redo operations must be _________ to guarantee correct behaviour, even if a failure occurs during recovery process.
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A
A. Idempotent
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B
B. Easy
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C
C. Protected
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D
D. All of the mentioned
Correct Answer:
A. A. Idempotent
Explanation:
Idempotent – Multiple executions of an operation have the same result as does one execution.