The demand for subassembly S is 100 units in week 7. Each unit of S requires 2 units of T and 1 unit of U. Each unit of T requires 1 unit of V, 1 unit of W, and 1 unit of X. Finally, each unit of U requires 1 unit of Y and 3 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U. 2 weeks to make V, 3 weeks to make W. 2 weeks to make X. 2 weeks to make Y, and 1 week to make Z. a) Choose the correct product structure. OA. . Level 0 Level 0 S O o S T2) V1) V1) U1) 1 1 2 Yu Wu X) U23 2 Ti2) Wy) X(1) YU) 23) O C. OD Level 0 Level 0 S S 01) (2) T2) (1) 1 1 2 VU) Y1) 23) W) X1) 2 V W X Y Z3)