Which configuration ensures that the switch is always the root for VLAN 750?

Which configuration ensures that the switch is always the root for VLAN 750?
A. Switch(config)#spanning-tree vlan 750 priority 38418607
B. Switch(config)#spanning-tree vlan 750 priority 0
C. Switch(config)#spanning-tree vlan 750 root primary
D. Switch(config)#spanning-tree vlan 750 priority 614440

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