The demand for subassembly S is 100 units in week 7. Each unit of Srequires 1 unit of T and 1 unit of U. Each unit of T requires 1 unit of V, 1 unit of W, and 2 units 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. O A. OB. Level 0 Level 0 S S V(1) U (1) TO) U (1) 1 1 2 T W X2) Yu 23) 2 V W Xi2) Y() Z(3) OC. OD Level 0 Level 0 S s T(1) IVO U1) 1 1 T(1) 2 YU) W(1) X(2) U1) 23) 2 V(1) Y(1) Z(3) W(1) X(2) b) Choose the correct time-phased product structure. OA . Oc. OD. Q V V 2 Y w T w T w T S X X S S S T w Y Y Y u U V Z zi zi Time in weeks Time in weeks Time in weeks Time in weeks