Refer to the exhibit. Which statement is correct?
A. Setting the priority of this switch to 16384 for VLAN 1 would cause it to become the secondary root bridge.
B. IEEE 802.1s spanning tree is being used.
C. Spanning-tree PortFast should not be enabled on GigabitEthernet2/1.
D. The spanning-tree timers are not set to their default values.
