Points: 0 of 1 Sketch the graph of the following function. List the coordinates of where extrema or points of inflection occur. State where the function is increasing or decreasing as well as where it is concave up or concave dow f(x) = 3x4 - 18x2 What are the coordinates of the relative extrema? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The coordinates of the relative extrema are (Type an ordered pair. Type an exact answer using radicals as needed. Use a comma to separate answers as needed.) O B. There are no relative extrema