(1 point) You are given the function f (x) = 2' 2 . _ x + f(x) iS concave up whenever: A. x2 + 2 is negative. B. 3x2 + 2 is positive. 0. 33.:2 2 is positive. D. x2 - 2 is negative. E. 3ch2 - 2 is negative. 0 F. 33:2 + 2 is negative. f(x) is concave down whenever: K A. 33:2 + 2 is positive. B. 3362 + 2 is negative. , C. 33:2 2 is negative. 0. 3x2 2 is positive. E. x2 + 2 is negative. 0 F. at:2 2 is negative. The points of inflection of f (x) are the same as: A. the zeros of 3.7::2 2. B. the zeros x2 + 2. C. the zeros of 3x2 + 2. O D. the zeros of x2 2