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You are a data steward. You have been asked to restrict User A, who has an access clearance of "top secret" in a MAC-enabled network, from accessing files with the access label "secret." This, in turn, does not affect any other user. What action should you take?
A. Change the access label of the files to "confidential"
B. Change the access label of the files to "top secret"
C. Change the access clearance of User A to "confidential"
D. Change the access clearance of User A to "secret