Which of the following statements about the production function F(K,L) = K²L¹／²
where K is capital and L is labor, is true?
a. The absolute value of the technical rate of substitution increases when K increases.
b. Its iso-quants are convex to the origin
c. The marginal product of capital is diminishing.
d. The marginal product of labor is not diminishing.
e. It exhibits constant returns to scale.