Which of the following statements are true about the failover system mechanism?

Which of the following statements are true about the failover system mechanism?

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A . A failover system can only be used for legacy batch programs.
B.A failover system cannot span over more than one geographical region.
C.A failover system can be used to make redundant implementations of the same cloud service.
D.A failover system can be used to avoid introducing cloud services as single points of failure.

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Answer: CD