In the following exhibit, you are running RSTP. Which switch interfaces will become root ports?

A. Switch C Gi0/6, Switch B Gi0/4, Switch D Fa0/10
B. Switch A Gi0/0, Switch B Gi0/4, Switch D Gi0/8
C. Switch A Gi0/3, Switch C Gi0/6, Switch D Gi0/8
D. Switch C Gi0/7, Switch A Gi0/0, Switch B Fa0/5

B. All switches have the default priority. The lowest MAC address is Switch C, so the adjacent interfaces of Switch A Gi0/0 and Switch D Gi0/10 become root ports. Next we need to calculate the total path cost, and since the total path cost is higher between Switch B and Switch D, we turn the furthest port into a blocking state.