If switch SW1 is connected in a mesh with four other switches and all switches retain the default configuration, which command do you enter on SW1 interface to make it the root bridge for all VLANs?

If switch SW1 is connected in a mesh with four other switches and all switches retain the default configuration, which command do you enter on SW1 interface to make it the root bridge for all VLANs?
A . SW1(config)#spanning-tree port-priority 129
B . SW1(config)#spanning-tree port-priority 127
C . SW1(config-if)#spanning-tree port-priority 129
D . SW1(config-if)#spanning-tree port-priority 127

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Answer: D