The question is based on the following table that provides information on the production of a product that requires one variable input Input 0 1 2 3 Total Product o 5 20 32 42 50 55 58 58 56 Refer to the above table. Marginal product refers to the additional" or "extra" units of output produced as a result of adding one more unit of a variable input, such as labor. Therefore, in the table, marginal product is greatest at the Third unit of varlable input Seventh unit of variable input Ninth unit of variable input Second unds of variable input