Refer to the exhibit. A network engineer enables a new port channel between two switches. Both switches are configured for spanning-tree MST. What is causing the dispute message to appear on one of the switches?
A. The switch received an IEEE 802.1D BPDU on that port.
B. The BPDU that is received from the peer is inferior, with the designated role and state as learning or forwarding.
C. The peer switch has been configured with a different VLAN instance mapping.
D. The switch has received a malformed BPDU.
