Suppose Bank $"$A$"$ has only one teller. Assume that the coefficient of variation of interarrival times of customers, $c_a,$ and

coefficient of variation of effective process time of the teller, $c_e,$ are both equal to one. What will be the departure

variability, $c_d,$ and the utilization of the teller, $u?$

$c_d=1$ and $u=1$

$0c_{d}1$ and $u=1$

$c_d=1$ and $0c_{d}100$

$0c_{d}1$ and $0$