File integrity checking tools work by calculating hash values of important files, storing the hash values, and periodically comparing those hash values to hash values that it calculates later. If a file hash value comparison results in a mismatch, what does that indicate?

File integrity checking tools work by calculating hash values of important files, storing the hash values, and periodically comparing those hash values to hash values that it calculates later. If a file hash value comparison results in a mismatch, what does that indicate?
A . It means nothing; it is a mismatch because the files hashes were compiled on different days.
B . It means that one file did not calculate correctly and need to be recalculated.
C . It indicates that the file has been changed in some way and there may be an issue to be resolved.
D . It indicates that your organization has suffered a security breach and a full-scale investigation is needed as soon as possible.

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Answer: C