Which of the following security controls would be BEST to implement to mitigate the threat caused by the missing patch?

Following the most recent patch deployment, a security engineer receives reports that the ERP application is no longer accessible. The security engineer reviews the situation and determines a critical security patch that was applied to the ERP server is the cause. The patch is subsequently backed out.

Which of the following security controls would be BEST to implement to mitigate the threat caused by the missing patch?
A . Anti-malware
B . Patch testing
C . HIPS
D . Vulnerability scanner

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Answer: B