operations and supply chain: Which one of the following statements about Materials Requirement Planning (MRP) is true? A bill of materials is a listing of all the materials that needed to be ordered from a supplier to meet the forecasted customer demand. Part commonality tends to increase inventory costs. Gross requirements are the total demand derived from all parent production plans. In the context of materials requirements planning, usage quantity is the amount by which the finished goods inventory is depleted based on booked customer orders