How is the root bridge in STP elected?

A. The root bridge is the switch with the highest IP address and priority.
B. The root bridge is the switch with the lowest IP address and priority.
C. The root bridge is the switch with the lowest MAC address and priority.
D. The root bridge is the switch with the highest MAC address andpriority.

C. The root bridge is elected by all of the switches and has the lowest MAC address and priority of them all.