Spanning Tree Protocol calculates path cost based on which of these?

A.
interface bandwidth

B.
interface delay

C.
interface bandwidth and delay

D.
hop count

E.
bridge priority

Explanation:
STP calculates the path cost based on the media speed (bandwidth) of the links between switches and the port cost of each port forwarding frame. Spanning tree selects the root port based on the path cost. The port with the lowest path cost to the root bridge becomes the root port. The root port is always in the forwarding state.
If the speed/duplex of the port is changed, spanning tree recalculates the path cost automatically. A change in the path cost can change the spanning tree topology.