Huawei disaster preparedness plan, production site deployment oracle RAC cluster, in order to ensure the production side

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Huawei disaster preparedness plan, production site deployment oracle RAC cluster, in order to ensure the production side failure, disaster recovery database to provide normal service
Services.
Which of the following statement is correct?

A. Disaster recovery end must be deployed, oracle rac cluster can not deploy oracle single node.
B. Oracle RAC grid production side of the file must be copied to the disaster recovery side.
C. Unable to copy the production side of the FRA file will be able to guarantee the normal provision of services at the northern end.
D. Production end of the oracle data files and log files can not be placed in the same consistency group.