Find f'(x) for the following function. Then find f(4), f(0), and f'( - 8). f(x) = -6x- - 1x f'(xx)= Select the correct choice below and fill in the answer box within your choice, if needed. O A. '(4)= (Simplify your answer, if needed) O B. The answer is not a real number. O C. The answer is undefined. Select the correct choice below and fill in the answer box within your choice, if needed. O A. F(0) = (Simplify your answer.) O B. The answer is not a real number. O C. The answer is undefined. Select the correct choice below and fill in the answer box within your choice, if needed. O A. F(- 8)= (Simplify your answer.) O B. The answer is not a real number. O C. The answer is undefined