Find the largest open intervals on which The function is concave upward or concave downward, and nd the location of any.r points of inflection. x}: 3x3 +4x2 Select the correct choice below and ll in the answer hox{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} 0 A- The function is concave upward on D and concave downward on D. O B- The function is concave upward on D. The function never has an interval that is concave upwardl'downward. Cl C- The function is concave downward on D. The function never has an interval that is concave upwardfdownward. Find the largest open intervals on which the function is concave upward or concave downward. and nd the location of any points of inection. f(x)=2x3+2x22x+? Select the correct choice below and ll in the answer boxes 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.) C) A. The function is concave upward on El and concave downward on D. Q B, The function is concave downward on . There are no intervals on which the function is concave upward. C) c, The function is concave upward on El. There are no intervals on which the function is concave downward