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 minimum at x = +1; local maximum at x = -1; concave down on (0, ?); concave up on (-?, 0)
B. Local minimum at x = +1; local maximum at x = -1; concave up on (0, ?); concave down on (-?, 0)
C. Local minimum at x = +1; local maximum at x = -1; concave up on (-?, ?)
D. Local minimum at x = +1; local maximum at x = -1; concave down on (-?, ?)
Answer: B
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C. ?
D. ?
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A. 
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D. 