Each unit of product A is composed of two unit of B and two units of C. B is composed of one units of C and three units of D. Items A, B, C, and D have on-hand inventories of 20, 40, 100, and 20, respectively. Item B has a scheduled receipt of 50 units in period 1, and C has a scheduled receipt of 20 units in Period 2. Lead times are one period for Items A, and C, and two periods for Items B and D. The gross requirements for A are 15 in Period 2, 30 in Period 3, 60 in Period 4, 50 in Period 6, and 50 in Period 7. Assume the set up cost is $20, and Carrying cost is $0.4 per unit per period. (A)Draw the product structure diagram with lead times. (B) Use Lot-for-lot (LAL) to find the planned order releases for Items A C) Use Least Unit Cost Heuristic to find the planned order releases for Items C (use Lot- r-lot B)