A) \[f''(x)<0\]for all x
B) \[-1<f''(x)<0\]for all x
C) \[-2\,\underline{<}\,\,f''(x)\,\,\underline{<}-1\]for all x
D) \[f''(x)<-2\] for all x
E) None of these
Correct Answer: A
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