Wide Area Network (WAN) is a com
题目
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)
