Find the x-values of all points where the function has any relative extrema. Find the value(s) of any relative extrema f(x) = x-72x+6 First find the derivative of f(x) Now find any critical numbers of f(x) OA. The critical number(s) is/are (Use a comma to separate answers as needed) OB. There are no critical numbers of f(x) Find the x-values of all points where the function has any relative extrema. Find the value(s) of any relative extrema. Select the correct choice below a necessary, fill in any answer boxes within your choice. OA. There are no relative maxima. The function has a relative minimum of (Use a comma to separate answers as needed) OB. There are no relative minima. The function has a relative maximum of (Use a comma to separate answers as needed) at x= at x= OC. The function has a relative maximum of at x= and a relative minimum of at x= (Use a comma to separate answers as needed) OD. There are no relative extrema