The correct answer is: D. WAN
A wide area network (WAN) is a computer network that spans a large geographical area such as a country, state, or continent. It can be used to connect office LANs that are spread geographically apart on a large scale.
A CAN (campus area network) is a computer network that spans a single campus or a group of buildings that are close together.
A LAN (local area network) is a computer network that is confined to a small area such as a home, office, or school.
A DAN (distributed autonomous network) is a network of autonomous systems that are connected by a WAN.
A TAN (telephone area network) is a telephone network that serves a specific geographic area.