单选题Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）ADLCIBBECNCFECNDLMIECIRFDE
单选题
Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）
A
DLCI
B
BECN
C
FECN
D
LMI
E
CIR
F
DE
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