A company's Chief Information Security Officer (CISO) is concerned about the integrity of some highly confidential files

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A company's Chief Information Security Officer (CISO) is concerned about the integrity of some highly confidential files. Any changes to these files must be tied back to a specific authorized user's activity session. Which of the following is the BEST technique to address the CISO's concerns?

A. Configure DLP to reject all changes to the files without pre-authorization. Monitor the files for unauthorized changes. Most Voted
B. Regularly use SHA-256 to hash the directory containing the sensitive information. Monitor the files for unauthorized changes.
C. Place a legal hold on the files. Require authorized users to abide by a strict time context access policy. Monitor the files for unauthorized changes.
D. Use Wireshark to scan all traffic to and from the directory. Monitor the files for unauthorized changes.