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The undo and redo operations must be _________ to guarantee correct behaviour, even if a failure occurs during recovery process.
a) idempotent
b) easy
c) protected
d) all of the mentioned

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The undo and redo operations must be idempotent to guarantee correct behaviour, even if a failure occurs during recovery process.

Answer: a) idempotent
Explanation: Idempotent – Multiple executions of an operation have the same result as does one execution.

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