Refer to the exhibit.

Which two conditions can cause this error message to be displayed on the console? (Choose two.)

A.
The EtherChannel is configured as desirable on both ends.

B.
The port-channel on the adjacent device is misconfigured.

C.
There is a speed and duplex mismatch on interface fa0/12.

D.
The EtherChannel is configured as auto on one of the interfaces.