Why does NAT present a challenge to security monitoring?

Why does NAT present a challenge to security monitoring?
A . NAT can present a challenge when performing security monitoring and analyzing logs because data can be encrypted as a result of the network address translation.
B . NAT can present a challenge when performing security monitoring and analyzing logs because data can be dropped as a result of the network address translation.
C . NAT can present a challenge when performing security monitoring and analyzing logs, NetFlow, and other data because device IP addresses can be seen in the logs as the “translated” IP address versus the “real” IP address.
D . NAT can present a challenge when performing security monitoring and analyzing logs because data can be fragmented as a result of the network address translation.

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Answer: C