Port forwarding describes which of the following statements most accurately?

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Port forwarding lets traffic from the internet reach a specific device inside your network by mapping an external port to an internal IP and port. That makes the statement about allowing external access from the internet on a non-standard port to an internal device the most accurate.

For example, you could forward external port 8080 to an internal server at 192.168.1.50:80; someone on the internet would connect to your public IP on port 8080, and the router would send that traffic to 192.168.1.50 on port 80.

The other descriptions don’t fit: port forwarding isn’t about blocking all external connections, it’s about selectively routing traffic you’ve chosen to forward; it isn’t required to use port 80 and is configurable to any external and internal ports; and it doesn’t translate IPv4 to IPv6, which is a different mechanism.