The following information is known about a function f. (a) f(x), f'(x) and f"(x) are continuous functions defined for all values of x. (b) f'(x) = 0 when x = -2, x 0 and x = 5, and f"(x) = 0 when x = -4, x = -3, x = -2, x = -1 and x = 3. (c) f'(x) > 0 when -2 < x < 0 and 5 < x, and f'(x) < 0 when x