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