8. When a company produces a (a > 0) grams of its product, its profit is * (x) = 10232-275/2-1 dollars. Which of the following is true about the marginal profit ,'(x)? (a) n'(x) > 0 for all r > 0. (b) T' (1) = 0. (c) T'(x) > 3. (d) The marginal profit is never 0. (e) none of these