Find the open intervals where the function is concave upward or concave downward. Find any inflection points 1(xx ) = 2x ( * + 8 ) ? Where is the function concave upward and where is it concave downward? Select the correct choice below and, if necessa O A. The function is concave upward on the interval(s) The function is never concave downward (Type your answer in interval notation. Use integers or fractions for any numbers in the expression. Use a comma O B. The function is concave downward on the interval(s) The function is never concave upward (Type your answer in interval notation. Use integers or fractions for any numbers in the expression. Use a comma O C. The function is concave upward on the interval(s) The function is concave downward on the interval(s) (Type your answers in interval notation. Use integers or fractions for any numbers in the expressions. Use a comm O D. The function is neither concave downward nor concave upward. Find any inflection points of f. Select the correct choice below and, if necessary, fill in the answer box to complete your cho O A. The function f has an inflection point at (Simplify your answer. Type an ordered pair, using integers or fractions. Use a comma to separate answers as nee O B. The function f has no inflection points