(1 point) Let f (x) = x4 4x3 + 8x + 7. Find the open intervals on which f is concave up (down). Then determine the xcoordinates of all inflection points of f. 1. f is concave up on the intervals 2. f is concave down on the intervals 3. The inflection points occur at x = Notes: In the first two, your answer should either be a single interval, such as (0,1), a comma separated list of intervals, such as (inf, 2), (3,4), or the word "none". In the last one, your answer should be a comma separated list of x values or the word "none"