C. XCCDF (eXtensible Configuration Checklist Description Format) would be the BEST to use for analyzing and reporting any configuration issues on the information systems, and then verifying existing security settings. XCCDF is a specification language for writing security checklists, benchmarks, and related documents, designed to be used with security automation technologies, like SCAP (Security Content Automation Protocol) and OVAL (Open Vulnerability and Assessment Language). Using XCCDF, the systems administrator can define and document the desired secure configuration settings and then use security automation tools, such as SCAP or OpenSCAP, to scan systems against those settings and report any discrepancies.