The demand for subassembly S is 100 units in week 7. Each unit of S requires 1 unit of T and 2 units 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,1 week to make T,2 weeks to make U,1 week to make V,3 weeks to make W, 2 weeks to make X,2 weeks to make Y, and 2 weeks to make Z. a) Choose the correct product structure. A. Levi 0 B. Level C. b) Choose the correct time-phased product structure