What does a router do?（）

A. Stores data on the network and connects the local-area network (LAN) to the wide-area network (WAN)
B. Routes traffic down alternative paths and connects the local-area network (LAN) to the wide- area network (WAN)
C. Broadcasts data to all devices that are connected to it across the local-area network (LAN) and wide-area network (WAN)
D. Reads Media Access Control (MAC) addresses to forward messages to the correct location and connects the local-area network (LAN) to the wide-area network (WAN)