The preservation of electronic evidence is directly related to the legal effect of evidence, and it is in conformity with the preservation of legal procedures, and its authenticity and reliability are guaranteed. Which of the following is not an evidence preservation technique?

The preservation of electronic evidence is directly related to the legal effect of evidence, and it is in conformity with the preservation of legal procedures, and its authenticity and reliability are guaranteed. Which of the following is not an evidence preservation technique?
A . Encryption technology
B . Digital certificate technology
C . Digital signature technology
D . Packet tag tracking technology

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Answer: D