What situation would never cause an FRP port communication failure by itself?

What situation would never cause an FRP port communication failure by itself?

A.
Disconnecting or turning off the device connected to a Frame Relay port.

B.
Setting the port to transmit LMI differently from the connected device.

C.
Setting the port to not use LMI.

D.
Setting the port to use LMI with a non-LMI device.