单项选择题

A.A network that is restricted.to A single building ,A ……

What is A WAN?（）

A.A network that is restricted.to A single building ,A group of buildings, or even A single room.
B.A network that encompasses an entire city or metropolitanared and connects multiple LANs.
C.A network that connects client devices wirelessly using radio waves.
D.A network that crosses metropolitan, regional, or national boundaries.

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