Which extension of Network Address Translation is used one IP address that allows many users to connect to the global Internet?

Option: D
Explanation :Port address translation (PAT) is a function that allows multiple users within a private network to make use of a minimal number of IP addresses. Its basic function is to share a single IP public address between multiple clients who need to use the Internet publicly. It is an extension of network address translation (NAT).
Port Address Tranlation is also called porting, port overloading, port-level multiplexed NAT and single address NAT.

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