Determine the intervals on which the function is increasing, decreasing, and constant.
A. Increasing on (-?, -1); Decreasing on (-1, ?)
B. Increasing on (1, ?); Decreasing on (-?, 1)
C. Increasing on (-1, ?); Decreasing on (-?, -1)
D. Increasing on (-?, 1); Decreasing on (1, ?)
Answer: C
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B. 
C. 
D. 