Each unit of A is composed of one unit of B, two units of C, and one unit of D. C is composed of two units of D and three units of E. Items A, C, D, and E have on-hand inventories of 20, 10, 20, and 10 units, respectively. Item B has a scheduled receipt of 10 units in period 1, and C has a scheduled receipt of 50 units in period 1. Lot for lot (l4l) lot sizing is used for items A and B. item C requires a minimum lot size of 50 units. D and E are required to be purchased in multiples of 100 and 50, respectively. Lead times are one period for items A, B, and C, and two periods for items D and E. The gross requirements for A are 30 in period 2, 30 in period 5, and 40 in period 8. a) draw product structure. b) develop master production schedule