An MRP exercise is being implemented over an 8-week period and the following relevant information is provided: One unit of A is made of two units of B and three units of C. One unit of B is made up of three units of D and two units of E. One unit of C is made up of two units of B and two units of D. Items A, C and E have one (1) week lead time. Items B and D have lead times of two weeks. Assume that lot-for lot sizing is used for Items A, C and E and a lot size of 100 is used for items B and D. Items A and D have beginning inventories of twenty and forty units respectively; all other items have zero beginning inventory. We are scheduled to receive ten units of item B in week two and twenty units of item D in week one. There are no other scheduled receipts. a. Draw the product structure tree with low level coding. b. Draw the corresponding time-phased diagram showing lead times to scale. c. If fifty units of A are required in Week eight, determine the necessary planned order releases for all components {five schedules}