If the standard deviation of service and inter-arrival times both double for a single-server queuing system, but the mean service and inter-arrival times remain the same, we expect:

(a) The mean service time to approximately double (b) The mean cycle time in the queue to approximately double (c) The mean cycle time in the queue to approximately grow by a factor of the square root of 2 (d) The mean cycle time in the queue to approximately grow by a factor of 4