What does the nat 0 command do?

What does the nat 0 command do?

A.
The nat 0 command, followed by an access list, specifies the addresses that are to be used in translations only once.

B.
The nat 0 command, followed by a range of IP addresses, specifies the addresses that are to be translated when used for IPsec.

C.
The nat 0 command, followed by a range of IP addresses, specifies the addresses that are to be translated using network address translation.

D.
The nat 0 command, followed by an access list, specifies the addresses that are not to be translated.