Determine the intervals on which the following function is concave up or concave down. Identify any inflection points. x) 2 3x4 4x3 + 3 Determine the intervals on which the given function is concave up or concave down. Select the correct choice below and fill in the answer box(es} to complete your choice. (Simplify your answer. Type your answer in interval notation. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) 0 A. The function is concave down on |:. O B. The function is concave up on :I. O C. The function is concave up on :I and concave down on :|. Locate any inection points of f. Select the correct choice below and, if necessary, ll in the answer box to complete your choice. 0 A- An inection point occurs at x = D. (Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) 0 B. There are no inflection points for f