9. Suppose a firm is currently using capital (K) and labor (L) such that the marginal product of capital is MPK = 40 and the marginal product of labor is MPL = 20. If the rental price of capital is r = $20 and the wage rate is w = $10, then this firmGroup of answer choicesnone of the other options.is minimizing cost of its current level of production.can reduce the cost of its current level of output by using a bit more L and a bit less K (in such a way to keep output constant).can reduce the cost of its current level of output by using a bit more L and a bit more K.can reduce the cost of its current level of output by using a bit more K and a bit less L (in such a way to keep output constant).