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ISACA Certified Information Security Manager · Isaca
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The most important objective of testing is to confirm the plan is complete and workable: that steps, roles, escalation paths, and scenarios are covered, and that gaps surface in a test rather than during a real incident. Thoroughness is the broadest objective, and it subsumes the narrower ones. Validating assumptions (B) is one part of it, recovery order (C) belongs to BCP/DRP, and BIA validation (D) is a continuity-planning concern.
ChatGPt is also confirmed
Test and validate incident response plans to confirm assumptions and response capabilities.