The demand for subassembly S is 100 units in week 7. Each unit of S requires 2 units of T and 2 units of U. Each unit of T requires 1 unit of V, 2 units 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, 2 weeks to make T, 2 weeks to make U, 1 week to make V, 2 weeks to make W, 1 week to make X, 2 weeks to make Y, and 1 week to make Z. a) Choose the correct product structure. OA OC Level 0 V(1) 1 2 T W X Level 0 U) S 1 Zas Wigs X 2 V Y Z Wiz) X(1) U T X b) Choose the correct sme-phased product structure. OA V Time in weeks 4/20 r Y Z W S a Q Q C Q Q OB. VI W X Y 2 T U 25 2T Time in weeks G OB. OD. OC. Level T(z) 1 2 Y W X Up Zo G Level 0 V Q Q 1 2 V W X Y Z G W X Y Z Tan T U 8 2 3 4 5 Time in weeks S 5 V Q Q 2 Q Q Uzi OD. W X Y 2 T U Time in weeks 5