Which of the following sites would be MOST appropriate in the case of a very short recovery time objective (RTO)?

A. Warm B. Redundant C. Shared D. Mobile

Correct Answer: A???? or B?????

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Note

The official answer (could be incorrect because NO comes from ISACA!) is: "A. Warm".

Other experts claim that the correct answer is: "B. Redundant".

Your expert opinion (and explanation) is strongly requested. Many thanks in advance.