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Find the x-values of all points where the function has any relative extrema. Find the value(s) of any relative extrema. f(x) =8 +(7+3x) 2/3 Select the correct choice below and, if necessary, fill in any answer boxes within your choice. O A. There are no relative maxima. The function has a relative minimum of at x = (Use a comma to separate answers as needed. ) O B. There are no relative minima. The function has a relative maximum of at x = (Use a comma to separate answers as needed.) C. The function has a relative maximum of at X - and a relative minimum of at x = (Use a comma to separate answers as needed.) D. There are no relative extrema