Vargas enterprises wish to determine the economic order quantity (EOQ) for a critical and expensive inventory item that is used in large amounts at a relatively constant rate throughout the year. The firm uses 450,000 units of the item annually, has order costs of $375 per order, and its carrying costs associated with this item are $28 per unit per year. The firm plans to hold safety stock of the item equal to 5 days of usage, and it estimates that it takes 12 days to receive an order of the item once placed. Assume a 365-day year. How many units of safety stock should Vargas hold? Select one: a. 7000 units b. 6,000 units O c. 6,412 units d. 6,165 units