Which change will ensure that Switch1 will be selected as the root bridge instead of Switch9?

Refer to the exhibit.

The switches on a campus network have been interconnected as shown. All of the switches are running Spanning Tree Protocol with its default settings. Unusual traffic patterns are observed and it is discovered that Switch9 is the root bridge. Which change will ensure that Switch1 will be selected as the root bridge instead of Switch9?
A. Raise the bridge priority on Switch1.
B. Lower the bridge priority on Switch9.
C. Raise the bridge priority on Switch9.
D. Physically replace Switch9 with Switch1 in the topology.
E. Disable spanning tree on Switch9.
F. Lower the bridge priority on Switch1.

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