单项选择题Refer to the exhibit. At the end of an RSTP election process, which access layer switch port will assume the discarding role?()
A.Switch3, port fa0/1
B.Switch3, port fa0/12
C.Switch4, port fa0/11
D.Switch4, port fa0/2
E.Switch3, port Gi0/1
F.Switch3, port Gi0/2