The graph of f is given below: Answer the following questions based on the graph of above. If there are more than 1 interval, write all the intervals separated with commas. Use 'oo' to write oo. If there is no answer, write 'DNE'. A) State the interval(s) over which fis increasing. notation. B) State the interval(s) over which is decreasing. notation. invalid interval invalid interval C) State the interval(s) over which is concave upward D) State the interval(s) over which is concave downward. E) State any inflection point(s) of f: x =