A) \[(-\,\infty ,\infty )\]
B) \[\left[ -4,\frac{3-\sqrt{21}}{2} \right]\cup (1,\infty )\]
C) \[\left( -\,3,5-\frac{\sqrt{27}}{2} \right)\cup (2,\infty )\]
D) \[[1,\infty )\]
Correct Answer: B
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