Find f'(x) for the following function. Then find f'(3), f'(0), and f'(-5). f(x)= 6 f'(x) = Select the correct choice below and fill in the answer box within your choice, if needed. OA. f'(3)= (Simplify your answer) OB. The answer is not a real number. OC. The answer is undefined. Select the correct choice below and fill in the answer box within your choice, if needed. OA. f'(0)= (Simplify your answer.) OB. The answer is not a real number OC. The answer is undefined. Select the correct choice below and fill in the answer box within your choice, if needed. OA. f'(-5)= (Simplify your answer.) OB. The answer is not a real number. OC. The answer is undefined