(1 point) -4 f ( I ) = 2 + 2 a) Find f'(a). b) Identify the graph that displays f in blue and f' in red. ? A. 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 oo and '-INF' for -oo, and use 'U' for the union symbol. Enter DNE if an answer does not exist. f is increasing on O f is decreasing on