When there is unpredictable variability, the long-run stability may not be achieved even when the average input rate is equal to the capacity rate (i.e., 1 = u) O (a) True O (b) False When the service times are exponentially distributed, we have: (a) Ca = Cs. O (b) Cs = 1. O (c) Cs = 0.5. O (d) Cs = 0. Increasing the throughput rate of a queueing system, while keeping its average inventory in the queue unchanged, would: O (a) Increase the average inter-arrival time. O (b) Decrease the average waiting time in the queue. O (c) A and B. 0 (d) None of the above