(x - 3)(x+9) Answer the questions below about the function whose derivative is f (x) = (x + 2)(x - 4) , XX - 2, 4. a. What are the critical points of f? b. On what open intervals is f increasing or decreasing? C. At what points, if any, does f assume local maximum and minimum values? a. What are the critical points of f? Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. x= (Use comma to separate answers as needed) O B. The function f has no critical points