An analyst finds that unpatched servers have undetected vulnerabilities because the vulnerability scanner does not have the latest set of signatures. Management directed the security team to have personnel update the scanners with the latest signatures at least 24 hours before conducting any scans, but the outcome is unchanged.
Which of the following is the BEST logical control to address the failure?
A . Configure a script to automatically update the scanning tool.
B . Manually validate that the existing update is being performed.
C . Test vulnerability remediation in a sandbox before deploying.
D . Configure vulnerability scans to run in credentialed mode.
Answer: A