Regarding the description of Network Address Port Translation (NAPT) and Only Translating Network Address (NO-PAT), which of the following statements is correct?

Regarding the description of Network Address Port Translation (NAPT) and Only Translating Network Address (NO-PAT), which of the following statements is correct?
A . After NAPT conversion, for external users, all messages will only come from the same IP address.
B . NO-PAT only supports protocol port conversion at the transport layer.
C . NAT only supports protocol address translation at the network layer.
D . NO-PAT supports protocol address translation at the network layer.

Answer: D

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