Which of the following is the PRIMARY reason to regularly update business continuity and disaster...

The primary reason to regularly update business continuity and disaster recovery documents is to ensure that the plans and procedures are aligned with the current business needs and objectives, and that they can effectively support the availability of business operations in the event of a disaster. Updating the documents also helps to enforce security policy requirements, maintain business asset inventories, and ensure audit and compliance requirements are met, but these are secondary benefits.

References = CISM Review Manual, 16th Edition eBook1, Chapter 9: Business Continuity and Disaster Recovery, Section: Business Continuity Planning, Subsection: Business Continuity Plan Maintenance, Page 378.