In the following exhibit, you want to make sure that Switch A always becomes the root bridge. Which command needs to be entered?

A. SwitchA(config)#spanning-tree vlan 1 priority 16384
B. SwitchA(config)#spanning-tree priority 16384
C. SwitchA(config)#spanning-tree priority 1
D. SwitchA(config)#spanning-tree vlan 1 priority 1

A. The network is running Rapid PVST+ since this is the default when you configure RSTP via the command spanning-tree mode rapid-pvst. The correct command is spanning-tree vlan 1 priority 16384. Priorities must always be configured in increments of 4,096.