单选题What is A WAN?（）AA network that is restricted.to A single building ,A group of buildings, or even A single room.BA network that encompasses an entire city or metropolitanared and connects multiple LANs.CA network that connects client devices wirelessly using radio waves.DA network that crosses metropolitan, regional, or national boundaries.
单选题
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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单选题What is A WAN？（）AA network that connects client devices wirelessly using radio wavesBA network that crosses metropolitan, regional, or national boundariesCA network that is restricted.to a single building ,a group of buildings, or even a single roomDA network that encompasses an entire city or metropolitanared. and. connects multiple LANs
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