Find the x-values of all points where the function has any relative extrema. Find the value(s) of any relative extrema.f(x)=12x+13x1213Select the correct choice below and, if necessary, fill in any answer boxes within your choice.A. The function has a relative maximum of at x= and a relative minimum of at x=(Use a comma to separate answers as needed.)B. There are no relative minima. The function has a relative maximum of at x=.(Use a comma to separate answers as needed.)C. There are no relative maxima. The function has a relative minimum of at x=(Use a comma to separate answers as needed.)D. There are no relative extrema.