5) The definition of the derivative of f(x) = x3 at x = 5 is: a) O f' 5) = lim (5 + 1)5 - 53 h - 0 h b )of' /5 ) = lim (5 + h) 3 + 53 h - 0 h c ) O 1 5 = lim (5 + h) - 53 h - 0 5 d) 0 5 11 K