You are configuring a NAT rule on a Cisco ASA. Which description of a mapped interface is true?
A. It is mandatory for all firewall modes.
B. It is optional in transparent mode.
C. It is optional in routed mode.
D. It is mandatory for identify NAT only.
interface PAT fallback—(Optional) The interface keyword enables interface PAT fallback. After the mapped IP addresses are used up, then the IP address of the mapped interface is used. If you specify ipv6 , then the IPv6 address of the interface is used. For this option, you must configure a specific interface for the mapped_ifc . (You cannot specify interface in transparent mode).