Queuing system A has a utilization of 80 percent, and queuing system B has a utilization of 90 percent. Both have a single server. Say the utilization of both systems increases by 5 percent; that is, A increases from 80 percent to 85 percent while B increases from 90 percent to 95 percent. Which system is likely to experience the bigger change in the average time in queue? 

a. System A. 

b. System B. 

c. Time in queue for each system will increase by the same amount. 

d. More information is needed to determine which has a bigger change in average time in queue.