At least one of the answers above is NOT correct. (1 point) Below is the graph of the derivative f' (I) of a function defined on the interval (0,8). You can click on the graph to see a larger version in a separate window. Refer to the graph to answer each of the following questions. For part (A), use interval notation to report your answer. (If needed, you use U for the union symbol.) (A) For what values of a in (0,8) is f(a) concave down? (If the function is not concave down anywhere, enter "{" without the quotation marks.) Answer: (0,4) U (4,6) (B) Find all values of a in (0.8) is where f(r ) has an inflection list them