Which statement is true about a NAT rule action of off?

Which statement is true about a NAT rule action of off?

A.
The NAT action of off is only supported for destination NAT rule-sets.

B.
The NAT action of off is only supported for source NAT rule-sets.

C.
The NAT action of off is useful for detailed control of NAT.

D.
The NAT action of off is useful for disabling NAT when a pool is exhausted.