Regarding the description of network address port translation (NAP ) and network address translation only (No-PAT), which of the following statements is correct?

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

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Answer: C