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单选题
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)
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