Set up the integral representing the volume of the solid obtained by rotating the region bounded by y = x + 1 and y = 3 - x2 about the x-axis. a) [" [(3 x) - (x + 1)] dr - - - b) [2x [(3 x) (x + 1)] dr 2 2x [(x + 1) (3 x)] dx c) [", "[ ( x + 1) ( 3 x)] dr d) e) 2 (x + 1) - (3 x)] dr - f) none of the above