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? 

Answer options:

A. Configure DLP to reject all changes to the files without pre-authorization. Monitor the files for unauthorized changes.
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.

A