Williston Technologies wishes to use MRP methodology to develop a plan for the next $9$ weeks. Williston Technologies has gathered the following information:$$Bill of materials$$A$$BC$$D$$Current Inventory Records$$Part Lead Time $($Weeks$)$ Lot Size Inventory Currently on Hand$$A $1$ LFL $100$ B $250150$ C $22550$ D $3$ LFL $150$Master Production Schedule$$Weeks Part $123456789$A $50050200001000100$a$.$ Using MRP methodology, how much of parts A$,$ B$,$ C$,$ and D should be ordered, and when should they be ordered?$$b$.$ Based on the material requirements plan developed for Williston Technologies, how much of parts A$,$ B$,$ C$,$ and D will remain in inventory at the end of week $9?$ c$.$ Williston Technologies has just learned that the order for $200$ As appearing in week $4$ has been cancelled. How does this change the material requirements$$plan$?$