Find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema. Question list K f(x) = x5 -12x +4 O Question 8 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O Question 9 O A. The function is increasing on (Type your answer in interval notation. Type integers or simplified fractions. Use a comma to separate answers as needed.) O B. The function is never increasing. O Question 10 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O Question 11 O A. The function is decreasing on (Type your answer in interval notation. Type integers or simplified fractions. Use a comma to separate answers as needed.) O B. The function is never decreasing. O Question 12 Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. (Type integers or simplified fractions.) O Question 13 A. The function has a local minimum f () = , and no local maximum. O B. The function has a local maximum f( = and a local minimum f() =. O Question 14 O C. The function has a local maximum f () = , and no local minimum. O D. The function has no local extrema. Question 15