单项选择题
Wide Area Network (WAN) is a computer network that covers a broad areA. Which statement is correct for wide-area network (WAN)?（）
A.Connects client devices wireless protocol
B.Crosses metropolitan, regional, or national boundaries
C.Limited in a single building, a group of buildings, or even a single room
D.Encompasses an entire city or metropolitan area and connects multiple local-area networks (LANs)
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