Which of the Following Is INCORRECT in Describing Network Address

Which of the following is INCORRECT in describing network address translation?

A) NAT makes network design, management, and expansion flexible.
B) The router is a type of network device that the NAT function is implemented.
C) Only the sender's (source) IP address, not the receiver's address, should be translated when the packet goes out to the Internet.
D) One-to-one mapping is faster and more accurate than many-to-one mapping in IP conversion.
E) NAT shields internal computers and intermediary devices from casual snooping by outsiders.