Which of the following provides the BEST mechanism to achieve this goal?

A systems administrator needs to configure an email client to ensure data integrity of the email messages.

Which of the following provides the BEST mechanism to achieve this goal?
A . Cyclic redundancy check
B. SHA-1 hashes
C. SHA-256 hashes
D. Digital signature

Answer: D

Explanation:

To ensure data integrity of email messages, a mechanism that can verify that the content has not been altered is needed. Digital signatures provide this functionality by using cryptographic techniques to create a signature of the message. This signature can then be verified by the recipient to ensure that the message has not been tampered with.

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