I need help choosing the correct one. Thank you in advance

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 +x-5 Select the correct choice below and, if necessary, fill in any answer boxes within your choice. O A. The function has a relative maximum of|at x = and a relative minimum of |atx= (Use a comma to separate answers as needed.) O B. There are no relative maxima. The function has a relative minimum of at x = (Use a comma to separate answers as needed.) O C. There are no relative minima. The function has a relative maximum of at x = (Use a comma to separate answers as needed.) O D. There are no relative extrema