Electronic evidence preservation is directly related to the legal validity of evidence. Only preservation that complies with legal procedures can ensure its authenticity and reliability. Which of the following is not an evidence preservation technology?

Electronic evidence preservation is directly related to the legal validity of evidence. Only preservation that complies with legal procedures can ensure its authenticity and reliability. Which of the following is not an evidence preservation technology?
A . Encryption technology
B . Digital certificate technology
C . Digital signature technology
D . Message mark tracking technology

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Answer: D