多选题At which layers of the OSI model do WANs operate?（）Aapplication layerBsession layerCtransport layerDnetwork layerEdatalink layerFphysical layer
多选题
At which layers of the OSI model do WANs operate?（）
A
application layer
B
session layer
C
transport layer
D
network layer
E
datalink layer
F
physical layer
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