Refer the exhibit. Which configuration elects SW4 as the root bridge for VLAN 1 and puts G0/2 on SW2 into a blocking state?
A. SW4(config)#spanning-tree vlan 1 priority 0
!
SW2(config)#int G0/2
SW2(config-if)#spanning-tree cost 128
B. SW4(config)#spanning-tree vlan 1 priority 0
!
SW2(config)#interface G0/2
SW2(config-if)#spanning-tree vlan 1 port-priority 64
C. SW4(config)#spanning-tree vlan 1 priority 32768
!
SW2(config)#int G0/2
SW2(config-if)#spanning-tree cost 128
D. SW4(config)#spanning-tree vlan 1 priority 32768
!
SW2(config)#interface G0/2
SW2(config-if)#spanning-tree vlan 1 port-priority 0
Correct Answer: A