For the graph shown, identify a) the point(s) of inflection and b) the intervals where the function is concave up or concave down. a) The point(s) of inflection isfare . (Type an ordered pair. Use a comma to separate answers as needed.) b) Identify the intervals where the function is concave up or concave down. The function is concave up on D and concave down on D. (Simplify your answers. Type your answers in interval notation. Use a comma to separate answers as needed.)