A Chief Information Security Officer (CISO is reviewing and revising system configuration and hardening guides that were developed internally and have been used several years to secure the organization`s systems. The CISO knows improvements can be made to the guides. Which of the following would be the BEST source of reference during the revision process? 

Answer options:

A. CVE database
B. Internal security assessment reports
C. Industry-accepted standards
D. External vulnerability scan reports
E. Vendor-specific implementation guides

A