Which of the following methods is configured on a router to convert an internal IP address to an external IP address?

A DMZ (demilitarized zone) is a subnetwork that exposes an organization's external-facing services to an untrusted network, but it doesn't primarily convert internal to external IP addresses.

MAC filtering is a security method that allows or denies network access based on a device's MAC address, not for IP address translation.

QoS (Quality of Service) prioritizes network traffic to ensure performance for critical applications but does not perform IP address conversion.

Network Address Translation (NAT) is a method used by routers to remap IP address spaces. Specifically, it allows multiple devices on a private internal network, each with a private IP address, to share a single public IP address when communicating with external networks like the internet.