Find the open intervals where the function is concave upward or concave downward. Find any inflection points.
A. Concave upward on (-1, ?); concave downward on (-?, 2); inflection points at (-1, 0) and (2, -3)
B. Concave upward on (0, ?); concave downward on (-?, 0); inflection points at (-4, 0), (-1, 0), and 
C. Concave upward on (0, ?); concave downward on (-?, 0); inflection point at (0, -1)
D. Concave upward on (-1, ?); concave downward on (-?, 2); inflection point at (2, -3)
Answer: C
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