C.Security patches fix known vulnerabilities that attackers can exploit to compromise systems in the CDE
D.Patching is optional if a firewall is in place
Why C is correct
Patch management addresses known security vulnerabilities. Without timely patching, attackers can exploit documented vulnerabilities to gain unauthorized access to systems processing or storing cardholder data.
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Where this fits in the PCI DSS exam
Vulnerability Management
Covers vulnerability management concepts and practices within PCI DSS.
This question belongs to the "Vulnerability Management" domain, which makes up about 15% of the PCI DSS exam.
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How often must external vulnerability scans by an ASV be performed?