Find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema. f(x) = (x -8) e -6x . . . . . Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The function is increasing on (Type your answer using interval notation. Type integers or simplified fractions. Use a comma to separate answers as needed.) O B. The function is never increasing. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The function is decreasing on (Type your answer using interval notation. Type integers or simplified fractions. Use a comma to separate answers as needed.) O B. The function is never decreasing. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. (Type an integer or decimal rounded to four decimal places as needed. Use a comma to separate answers as needed.) O A. The function has local maximum f(c) = and no local minimum. O B. The function has local maximum f(c) = and local minimum f(c) = O C. The function has local minimum f(c) = and no local maximum. O D. The function has no local extrema