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The interval to which a may belong so th...

The interval to which a may belong so that the function `f(x)=(1-(sqrt(21-4a-a^2))/(a+1))x^3+5x+100` is increasing for `x in R`

A

`[-7, 0]`

B

`[-6, 0]`

C

`[1, 4]`

D

`[2, 3]`

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The correct Answer is:
D
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