A hub is a device that connects:

A. two LANs using different protocols.

B. a LAN with a WAN.

C. a LAN with a metropolitan area network (MAN).

D. two segments of a single LAN.

Explanation:

A hub is a device that connects two segments of a single LAN. A hub is a repeater. It provides transparent connectivity to users on all segments of the same LAN. It is a level 1 device.