Answer the following questions about the function whose derivative is given below. minMam) a. What are the critical points of f? b. On what intervals is f increasing or decreasing? c. At what points, if any: does fassume local maximum and minimum values? The critical points of f are X = (Simplify your answer. Use a comma to separate answers as needed.) The function f is increasing on tre subintervalts) D and decreasing on the subintervallfs) |:|. (Type your answer in interval notation. Use a comma to separate answers as needed.) The function f has a local maximum at x = D and a local minimum at x = D. (Simplify your answer.)