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The set of all values of the parameters \( a \) for which the points of minimum of the function \( y=1+a^{2} x- \) \( x^{3} \) satisfy the inequality \( \frac{x^{2}+x+2}{x^{2}+5 x+6} \leq 0 \) is
(a) an empty set
(b) \( (-3 \sqrt{3},-2 \sqrt{3}) \)
(c) \( (2 \sqrt{3}, 3 \sqrt{3}) \)
(d) \( (-3 \sqrt{3},-2 \sqrt{3}) \cup(2 \sqrt{3}, 3 \sqrt{3}) \)
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