Suppose that the graph below is the graph of f' (x), the derivative of a a) List any open interval(s) on which f(x) is increasing. Select the correct choice below and, if necessary, fill in the answer box to c function f(x). Find the open intervals where f(x) is a) increasing, or b) your choice. decreasing OA (Type your answer in interval notation. Use a comma to separate answers as needed.) O B. The function f(x) is never increasing. b) List any open interval(s) on which f(x) is decreasing. Select the correct choice below and, if necessary, fill in the answer box to o your choice. O A. (Type your answer in interval notation. Use a comma to separate answers as needed.) X O B. The function f(x) is never decreasing - 10 -8 -8-4 -/b 12 / 4 8 8 10