(1 point) 2 f(x) = - 12 + 2 a) Find the first and second derivatives. -4x f' (x) = (x 2 + 2 ) f"(x) = 4(3x2 - 2) (x2+ 2)3 b) Identify the graph that displays f in blue and f" in red. C v A. B D 12:09 P c) Using the graphs of f and f", indicate where f is concave up and concave down. Give your answer in the form of an interval or a comma-separated list of intervals. (For each listed interval, pay close attention to whether the endpoints should be included.) f is concave up on f is concave down on NOTE: When using interval notation in WeBWork, remember that: You use 'INF' for oo and '-INF' for -OO. Separate multiple intervals with commas ",". Enter DNE if an answer does not exist. :09