You notice that a new CVE has been shared to an email group that you...

TheCCST Cybersecuritymaterial describes that the first step after receiving a new CVE notification is toreview its details—such as affected systems, severity, and exploitability—to determine if it is relevant to your organization.

"Upon learning of a new CVE, security teams should analyze the vulnerability description, affected products, and CVSS score to determine applicability and urgency of mitigation."

(CCST Cybersecurity,Vulnerability Assessment and Risk Management, Vulnerability Prioritization section, Cisco Networking Academy)

Ais correct: Confirming applicability avoids unnecessary remediation for irrelevant vulnerabilities.

Bis done after confirming applicability.

C(disaster recovery plan) is unrelated to immediate CVE handling.

D(adding to firewall rules) is premature without confirming impact.