Which Frame Relay feature is responsible for transmitting keepalives to ensure that the PVC does not shut down because of inactivity?（）A、DLCIB、BECNC、FECND、LMIE、CIRF、DE
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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