QB A rm is paying 58 per unit of labor input and 532 per unit of energy input. At its current level of input usage, the marginal product of labor is 20 and the marginal product of energy is 100 so _ the rm should increase its usage of energy and decrease its usage of labor the firm should increase its usage of labor and decrease its usage of energyr the firm is optimally using labor and energy the rm should increase its usage of both labor and energy, but increase its use of labor more than its use of energy COED}