... img1.heic v 1 Q Q J Q Search Find f'(x) and find the value(s) of x where the tangent line is horizontal. F ( x ) = x 3 ( x - 8)5 . . . f' (x ) = Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The tangent line is horizontal at x = (Use a comma to separate answers as needed.) O B. The tangent line is never horizontal. clevaliSpecUn....pul DUSITICSS INGLY....UGA