12 Suppose that a firm's production function is given by F(K. L) = (3K 2 + 3L , in which case the marginal product of capital and labor are given by 3 3K 2 + 3L 3 3K 2 + 3L MPK = and MPL = respectively. On which isoquant line does the production level determined by ( K , L) = (4,4) fall, and what is L the slope of the isoquant line, or marginal rate of technical substitution, at that point? It falls on the isoquant line determined by a production level of q = 144, and the slope of the isoquant line at this point is 1. O It falls on the isoquant line determined by a production level of q = 16, and the slope of the isoquant line at this point is - 1. O It falls on the isoquant line determined by a production level of q = 16, and the slope of the isoquant line at this point is 1. O It falls on the isoquant line determined by a production level of q = 144, and the slope of the isoquant line at this point is - 1