Consider the following example. Which inventory control policy is best captured by the example?

Example: An overhaul and repair facility for construction equipment and other large vehicles maintains small parts, such as o$-$rings, in a two$-$bin system. Whenever an oring is needed, the item is pulled from the first bin until it is empty. When the first bin is empty, the second bin is dumped into the first bin $($for the next demand$)$ and an order is placed for a predetermined amount. When the order arrives, the second bin is filled to a set amount while the remainder of the order is placed in the first bin.

Order$-$Point, Order$-$Quantity $($s$,$ Q$)$ System

Order$-$Point, Order$-$Up$-$to$-$Level $($s$,$ S$)$ System

Periodic$-$Review, Order$-$Up$-$to$-$Level $($R$,$ S$)$ System

Period$-$review, Order$-$Point, Order$-$Up$-$to$-$Level $($R$,$ S$,$ S$)$ System