Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local maximum at x = 3; local minimum at x = -3 ; concave up on (0, -3) and (3, ?); concave down on (-3, 3)
B. Local minimum at x = 3; local maximum at x = -3 ; concave up on (0, -3) and (3, ?); concave down on (-3, 3)
C. Local minimum at x = 3; local maximum at x = -3 ; concave up on (0, ?); concave down on (-?, 0)
D. Local minimum at x = 3; local maximum at x = -3 ; concave down on (0, ?); concave up on (-?, 0)
Answer: C
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