(20 points) Develop an MRP record for six periods using the following parameters for the item: 4 5 Period Gross requirements 1 2 10 o 20 30 20 30 8 6 5 Lead time Lot size Safety stock Inventory Scheduled receipt 1 period 30 units 0 units 3 units 40 units in period 1 a. In what periods are there planned order releases? b. What happens to timing, number of planned order releases, and average inventory (for periods 1 through 6) if 15 units of safety stock are required? c. What happens to timing, number of planned order releases, and average inventory (for periods 1 through 6) if a one-week safety lead time is used instead of the safety stock