单选题Which WAN service utilizes two different encapsulation types (one for data and one for signaling) on its data link layer?（）AISDNBFrame RelayCATMDFDDI
单选题
Which WAN service utilizes two different encapsulation types (one for data and one for signaling) on its data link layer?（）
A
ISDN
B
Frame Relay
C
ATM
D
FDDI
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