27. Please solve neatly. Thank you

Find the x-values of all points where the function has any relative extrema. Find the value(s) of any relative extrema. 4 21 f(x) = 5x + 16 Select the correct choice below and, if necessary, fill in any answer boxes within your choice. O A. There are no relative minima. The function has a relative maximum of at X = (Use a comma to separate answers as needed.) O B. The function has a relative maximum of at x = and a relative minimum 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.) O D. There are no relative extrema