If the devices produced the given output, what is the cause of the EtherChannel problem?

A.
SW1’s Fa0/1 interface is administratively shut down.
B.
There is an encapsulation mismatch between SW1’s Fa0/1 and SW2’s Fa0/1 interfaces.
C.
There is an MTU mismatch between SW1’s Fa0/1 and SW2’s Fa0/1 interfaces.
D.
There is a speed mismatch between SW1’s Fa0/1 and SW2’s Fa0/1 interfaces.
But the interfaces are down down in both routers, why is not the right answer?
Can someone explain?
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