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Disaster recovery, incident response, and business continuity plans are relevant to an incident or disaster, but in the question, there is no such incident or disaster mentioned. A change in the system could be done for many reasons, like updating, adding, or deleting any rule.
D. Change management procedure
Implementing new firewall rules is a significant change to the network security infrastructure. Adhering to change management procedures ensures these changes are made systematically, reducing the risk of errors and enhancing the security posture.