What does the log message “%IPNAT-6-DELETED:” indicate?

A.
A Network Address Translation has been lost, requiring immediate action.

B.
An unauthorized user possibly attempted to gain access.

C.
The message is for information only and requires no further action.

D.
A port on the device has been administratively shut down, requiring no further action

Explanation:
http://www.cisco.com/en/US/docs/ios/12_2sx/system/messages/sm2sx05.html