What value is primarily used to determine which port becomes the root port on each nonroot
switch in a spanning-tree topology?

A.
path cost

B.
lowest port MAC address

C.
VTP revision number

D.
highest port priority number

E.
port priority number and MAC address

Explanation:
The path cost to the root bridge is the most important value to determine which port
will become the root port on each non-root switch. In particular, the port with lowest cost to the root
bridge will become root port (on non-root switch).