A car wash facility has $4$ bays, each with its own line. Customers randomly select one of the lines, and the inter$-$arrival times at each bay are Exponentially distributed $($with the same average IA times at all bays$).$ The time to wash each car has the same probability distribution for all bays. The car wash manager is considering merging the separate lines into a single queue, with customers going in firstcome$-$first$-$served order to the next available bay. Assuming that customers do not balk or renege, which of the following statements are True $($check all that apply$)?$