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单项选择题With PGP, which of the following entity signs a users’s public key?()

A、 The sender of the message.

B、 The receipient of the message.

C、 The sender’s administrator who provides the sender with the PGP program.

D、 A third party that belongs to what’s often known as "web of trust", that can verify the relationship between the user and the key.

E、 The vendor of the PGP program.

  • D
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