Question 4: The Wuyou Corp. is making deciding what types of products, and how many of each type of product they should produce for the coming quarter. They can choose from a set of products, P; each unit of product p sold will produce a revenue rp. From historical demand, Wuyou estimates that they should not produce more than dp units of any product or they will be unable to sell them. Also, capacity in Wuyou's warehouse is limited, which means that at most F finished products can be stored in their warehouse. A set of raw materials, M, is used in production; product p needs units of raw material m to produce one unit. A maximum of Wm units of material m can be used, because of the limited availability of products due to supply chain issues. Develop an optimization model to help Wuyou Corp. maximize its revenue; clearly define any notation that you use.