Heather Adams, production manager for a Colorado exercise equipment manufacturer, needs to schedule an order for 50 Ultima Steppers, which are to be shipped in week 8. Subscripts indicate quantity required for each parent. Assume lot-for-lot ordering. Item Lead Time On-Hand Inventory Components Stepper 2 20 A(1), B(3), C(2) A 1 10 D(1), F(2) B 2 30 E(1), F(3) C 3 10 D(2), E(3) D 1 15 E 2 5 F 2 20 A)Develop a product structure for Heather B) Develop a time-phased structure C) Develop a net material requirements plan for F