E Homework: Instructor Homework Assignment #4 Question 6, 12.2.31 HW Score: 31.11% Part 1 of 2 O Points: 0 of 1 Find the largest open intervals on which the function is concave upward or concave downward, and find the location of any points of inflection. f(x) = 2x4 + 12x3 - 48x2 + 24x -4 Select the correct choice below and fill in the answer box(es) to complete your choice. (Type your answer in interval notation. Use a comma to separate answers as needed. Use integers or fractions for any numbers in the expression.) O A. The function is concave upward on and concave downward on O B. The function is concave downward on There are no intervals on which the function is concave upward. O C. The function is concave upward on . There are no intervals on which the function is concave downward