Please help!

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 -8x +5 First find the derivative of f(x). f' (x) = 4x - 16x Now find any critical numbers of f(x) O A. The critical number(s) is/are - 2,0.2 (Use a comma to separate answers as needed.) O B. 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 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 atx = (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.) O C. The function has a relative maximum of 5 at x - 0 and a relative minimum of ] at x =_ (Use a comma to separate answers as needed.) O D. There are no relative extrema