A single-server queuing system has an average service time of 16 minutes per customer, which is exponentially distributed. The manager is thinking of converting to a system with a constant service time of 16 minutes. The arrival rate will remain the same. The effect will be to: increase the utilization factor. Decrease the utilization factor. decrease the average time in the system. Increase the average time in the system. not have any effect since the service time is unchanged.