(1 point) f(x) = 13 -4.512 - 121 - 3 a) Find f' (I). b) Identify the graph that displays f in blue and f' in red. | ? v B. C. D. c) Using the graphs of f and f', indicate where f is increasing and decreasing. Give your answer in the form of an interval. NOTE: When using interval notation in WeBWork, remember that: You use 'INF for co and '-INF for -co. And use 'U' for the union symbol. Enter DNE if an answer does not exist. f is increasing on f is decreasing on