what should the network administrator’s next action be?

Refer to the exhibit.

Given this output for SwitchC, what should the network administrator’s next action be?

A.
Check the trunk encapsulation mode for SwitchC’s fa0/1 port.

B.
Check the duplex mode for SwitchC’s fa0/1 port.

C.
Check the duplex mode for SwitchA’s fa0/2 port.

D.
Check the trunk encapsulation mode for SwitchA’s fa0/2 port.