Which of the following statement about the NAT is wrong?

• A.Address Translation can follow the needs of users, providing FTP, WWW, Telnet and other services outside the LAN
• B.For some non-TCP, UDP protocols (such as ICMP, PPTP), unable to do the NAT translation
• C.NAT technology can effectively hide the costs of the LAN; it is an effective network security protection technology
• D.Some application layer protocols carry IP address information in the data, but also modify the IP address information in the data of the upper layer when they are as NAT

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