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Answer the following questions about the function whose derivative is f' (x) = x (x - 5 ). 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. Find the critical points, if any. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The critical point(s) of f is/are x = (Simplify your answer. Use a comma to separate answers as needed.) O B. The function f has no critical points