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

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

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Answer: B