Which of the following statements is correct? Group of answer choices The optimal order quantity for the quantity discount model is always at one of the price breakpoints. The inventory turnover ratio shows how efficiently a firm is using its inventory to generate revenue. When demand and lead time are constant, the reorder point (ROP) is less than the demand during lead time. The (s, S) continuous review policy is to order the same quantity, Q, when physical inventory reaches the reorder point