Ken 81 Co. manufactures three products using three different machines. Selling price per unit are $28 for product 1, $29 for product 2, and $30 for product 3. The costs/unit of producing each product on each machine are shown in the following table: Machine 1 Machine 2 Machine 3 Product 1 Product 2 Product 3 The company wants to determine how many units of each product to produce to maximize profit (contribution) margin. Let :35}- : number of units of productz' from machine 3'; 1' = 1, 2. 3 j: 1, 2, 3 Select the best interpretation for each of the following constraints from the given options: a) 211 + 21 + 231