what should the network administrator’s next action be?

Given this output for Switch3, what should the network administrator’s next action be?

A.
Check the trunk encapsulation mode for SWITCH3’s fa0/1 port.

B.
Check the trunk encapsulation mode for SWITCH1’s faO/2 port.

C.
Check the duplex mode for SWITCH3’s fa0/1 port.

D.
Check the duplex mode for SWITCH1’s faO/2 port.