单选题Which one of the WAN data-link protocols below is used for out-of-band signaling?（）AHDLCBNCPCPAPDLAPDELAPBFNone of the above
单选题
Which one of the WAN data-link protocols below is used for out-of-band signaling?（）
A
HDLC
B
NCP
C
PAP
D
LAPD
E
LAPB
F
None of the above
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