单选题
With PGP， which of the following entity signs a users’s public key？（）
发布日期：2021-03-17
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.
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