Which command set should you run?

You have two Cisco Nexus 7700 Series switches named SwitchA and SwitchB.
You use the Rapid PVST+ protocol.
You must configure the switches as the STP root switches for VLANs 100 to 200. Which command set should you run?
A. SwitchA(config)# spanning-tree vlan 100-200 priority 61440 SwitchB(config)# spanning- tree vlan 100-200 priority 61440
B. SwitchA(config-if)# spanning-tree guard root
SwitchB(config-if)# spanning-tree guard root
C. SwitchA(config-if)# spanning-tree cost 100
SwitchB(config-if)# spanning-tree cost 100
D. SwitchA(config)# spanning-tree vlan 100-200 root primary SwitchB(config)# spanning- tree vlan 100-200 root secondary

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