NAT is used to send a packet to the outside network, using a public IP address to make it routable. The NAT logic is " inside-to-outside " FIRST and " outside-to-inside " THEN. This way, configuring NAT means " choosing a public IP address " for any outbound packet " IN THE FIRST PLACE, where " public IP address " translates to " inside global address " . Among the given answers, the only inside global address is 172.123.104.4.
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