When using Rapid PVST+, which command guarantees the switch is always the root bridge for VLAN 200?

When using Rapid PVST+, which command guarantees the switch is always the root bridge for VLAN 200?
A . spanning -tree vlan 200 priority 614440
B . spanning -tree vlan 200 priority 0
C . spanning -tree vlan 200 priority 38572422
D . spanning -tree vlan 200 root primary

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Answer: B