1. (15 points total) True or False with explanation (explanation determines credit). a. (5) A production mction with constant returns to scale can exhibit diminishing marginal product of its inputs. (5) Suppose a production function only uses one input, labor. If production displays constant returns to scale, then it does not exhibit diminishing marginal product of labor. (5) Suppose a production function utilizes both capital (K) and labor (L) as inputs. For this production mction, an increase in L (holding K constant) leads to an exact proportional increase in output. That is, for instance, increasing L by a factor of two yields twice as much output. Then, this production function must display increasing returns to scale