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One unit of final item 'A' requires two units of item 'B' and four units of item 'C”. Again, one unit of item 'B' requires two units of item 'D' and one unit item Έ. Items : 'D' and Έ are purchased from different suppliers with various lead time. The beginning inventory levels of items Ά', 'B. 'D' and 'E' are 100, 0, 100, 50 and 0 respectively. The assembly time with items 'B' and 'C' to produce final item 'A' is 2 weeks. The assembly time with items 'D and 'E' to produce item P is 1 week. The time intervals between ordering and receiving for items 'C', 'D' and 'E' are 3, 2 and 1 week respectively. The items 'C' and 'D' are purchased with lot-for-lot (LFL) ordering policy but the item 'E' is purchased with lot-size (LS) ordering policy. If you know that Item A is required according to the following data, Week 12 250 200150 300 250 8 10 Required Quantity (A) You are required to, Draw the product structure tree (Bill of materials), Show both a single-level parts list and an indented parts list Determine the net requirements for all the component items