A network firewall has been configured with the latest vendor security patches.

PerRequirement 2.2.5, allinsecure and unnecessary services, protocols, daemons, or functionsmust be disabled. This includes unnecessary features on firewalls and other devices. Disabling unneeded functions reduces the attack surface and aligns with secure configuration principles.

Option A:❌Incorrect. Shared accounts violateRequirement 8.2.1, which mandatesunique IDs.

Option B:❌Incorrect. Allowing all traffic is a violation ofRequirement 1.2.1, which requires "deny all unless explicitly allowed".

Option C:❌Incorrect. Synchronizing rules may be useful but does not directly relate to hardening.

Option D:✅Correct. Disabling unused firewall features aligns with secure configuration.