Refer to the exhibit.If the devices produced the given output,what is the cause of the EtherChannel problem?（）
- AThere is a speed mismatch between SW1's Fa0/1 and SW2's Fa0/1 interfaces.
- BThere is an MTU mismatch between SW1's Fa0/1 and SW2's Fa0/1 interfaces.
- CThere is an encapsulation mismatch between SW1's Fa0/1 and SW2's Fa0/1 interface.
- DSW1's Fa0/1 interface is administratively shut down.