Question 3 (1.5 point) (a) (0.5 points) What kind of returns to scale does this production function exhibit? f(Z1, Z2) = [min{ z1, 322}12 Oa. Increasing returns to scale Ob. Decreasing returns to scale Oc. Cannot be determined from the given information Od. Constant returns to scale (b) (1 point) At (Z1, Z2) = (4, 6), the marginal product of Z1 is and the marginal product of Z2 is