Heather Adams, production manager for a Colorado exercise equipment manufacturer, needs to schedule an order for 50 UltimaSteppers, which are to be shipped in week 9. Subscripts indicate quantity required for each parent. Assume lot-for-lot ordering. This exercise contains only parts b and c. Click the icon to view information about the steppers. The product structure is as follows: Stepper A2) B) C1) DO) F3) E2) F) D1) E1) b) Choose the correct time-phased structure OA. OB. OC. OD D A A F E E F stepper B B stepper B stepper B stepper HA F F D F D D ch CL E E E 6785 Time in weeks 8 9 Time in weeks Time in weeks Time in weeks - X More Info Lead Time 2 Item Stepper B 1 On-Hand Inventory 20 20 20 10 15 Components A2), B(3). C) D(2), F3) E(2), F (2) D(1), E(1) 2 3 1 D E F N N 2 2 20