The set of values of a for which the ine...

The set of values of a for which the inequality, `x^2 + ax + a^2 + 6a < 0` 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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The correct Answer is:

D

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