You are troubleshooting a frame relay problem with the serial0 interface on one of your HW routers. When the interface is brought up, it stays up for a short time before it goes back down. You issue the show interface command, and from this you can see that your interface shows LMI status messages sent, but none received.
What could be the problem?
A . There are too many input errors on the line.
B . The Frame-Relay lmi-type is set incorrectly.
C . There are too many configured sub-interfaces, causing the IDB limit to be exceeded.
D . The DCD is not set correctly for a Frame-Relay circuit.
E . Keepalives are not set correctly on both ends.
Answer: B