What keyword enables port address translation on a Cisco router?

What keyword enables port address translation on a Cisco router?

• overload
• pat
• ip nat outside interface subcommand
• nat 

EXPLANATION

Port Address Translation (PAT) {also known as Network Address Port Translator (NAPT)}. Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to conserve IP addresses.