After configuring FabricPath, the following appears in the syslog:
%STP-2-L2GW_BACKBONE_BLOCK: L2 Gateway Backbone port inconsistency blocking port
port-channel100 on VLAN0010.
What is the cause of this message?

A.
STP must be disabled; message indicates that STP is enabled.

B.
STP is misconfigured; root guard must be disabled.

C.
An inferior BPDU is received on a Cisco FabricPath edge port.

D.
A superior BPDU is received on a Cisco FabricPath edge port.

Explanation: