4. (**) Consider the master schedule record shown in Problem 3. Suppose the production manager calls up and says that only 600 units will be finished in week 6, not the 700 units originally called for. Recalculate the projected ending inventory and available-to-promise numbers.What does a negative projected ending inventory value mean? How does it differ from a negative available-to-promise number? As a manager, which would be easier to deal with—a negative projected ending inventory value or a negative ATP?