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At what layer of the OSI layer does the encryption and decryption of the message take place?

User A is writing a sensitive email message to user B outside the local network. User A has chosen to use PKI to secure his message and ensure only user B can read the sensitive email.

At what layer of the OSI layer does the encryption and decryption of the message take place?
A . Application
B . Transport
C . Session
D . Presentation

Answer: D

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