A website administrator has received an alert from an application designed to check the integrity of the company’s website. The alert indicated that the hash value
for a particular MPEG file has changed. Upon further investigation, the media appears to be the same as it was before the alert. Which of the following methods has
MOST likely been used?

A.
Cryptography

B.
Time of check/time of use

C.
Man in the middle

D.
Covert timing

E.
Steganography