正解:D
The best way to ensure the effective execution of a disaster recovery plan (DRP) is to make sure that the procedures are available at both the primary and the failover location, so that the staff can access them in case of a disaster. The procedures should be clear, concise, and updated regularly to reflect the current situation and requirements. Having the procedures available at both locations also helps to avoid confusion and delays in the recovery process.
References = CISM Review Manual, 16th Edition eBook1, Chapter 9: Business Continuity and Disaster Recovery, Section: Disaster Recovery Planning, Subsection: Disaster Recovery Plan Development, Page 373.