The set of values of \( a \) for which the inequation \( x^{2}+a x+a^{2}+6 a0 \) is satisfied fo...

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The set of values of \( a \) for which the inequation \( x^{2}+a x+a^{2}+6 a0 \) is satisfied for all \( x \in(1,2) \) lies in the interval
(a) (1 2)
(b) \( [1,2] \)
(c) \( [-7,4] \)
(d) None of these
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