a. Find the open interval(s) on which the function is increasing and decreasing.b. Identify the function's local and absolute extreme values, if any, saying where they occur.f(x)=x1/5 (x²-16)a. On what open interval(s), if any, is the function increasing? Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice.A. The function is increasing on the open interval(s)(Simplify your answer. Type your answer in interval notation. Type an exact answer, using radicals as needed. Use a comma to separate answers asneeded.)B. The function is never increasing.