Explanation:

- WAN (Wide Area Network): It refers to a type of network, not a topology. It covers large geographic areas.

- MAN (Metropolitan Area Network): Again, this is a type of network, typically covering a city.

- SAN (Storage Area Network): This deals with storage devices and how they're networked, not a physical layout (topology)

- BUS: This is the correct answer. BUS is one of the main types of network topologies, describing how devices are physically connected.

- LAN (Local Area Network): Refers to a network in a small area, like an office or home, not a topology.