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A) \[(-\,\infty ,-1]\,\cup [3,\infty ]\]
B) \[(-\,\infty ,-1]\,\cup [2,3]\]
C) \[[-\,1,2]\,\cup [3,\infty ]\]
D) \[[-\,1,2]\,\cup [3,6]\]
Correct Answer: C
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