G1/2 is the root port for SW4, please choose the command so G1/1 can be the new root port?

G1/2 is the root port for SW4, please choose the command so G1/1 can be the new root port?
A . spanning-tree cost 1 on interface g1/1
B . spanning-tree cost 5 on interface gi0/1
C . spanning-tree port priority 0 on g1/1
D . spanning-tree port priority 0 on g1/2

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Answer: B