As a YourDomain instructor you are required to pick the valid statement concerning WANs.

A.
A network that connects client device wirelessly using radio waves.

B.
A network that crosses metropolitan, regional, or national boundaries.

C.
A network that is restricted to a single building, a group of buildings, or even a single room.

D.
A network that encompasses an entire city or metropolitan area and connects multiple local-area networks (LANs).