-8, I need help with this question.

Find the x-values of all points where the function has any relative extrema. Find the value(s) of any relative extrema. f(x) = x4 162x2 + 6561 E> Select the correct choice below and, if necessary, ll in any answer boxes within your choice. 0 A- There are no relative minima. The function has a relative maximum of D at x= |:|. (Use a comma to separate answers as needed.) 0 3- There are no relative maxima. The function has a relative minimum of D at X: D. (Use a comma to separate answers as needed.) 0 c- The function has a relative maximum of D at x = D and a relative minimum of D at x = D. (Use a comma to separate answers as needed.) 0 D. There are no relative extrema