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The interval to which 'b' may belong so ...

The interval to which 'b' may belong so that the function `f(x)=(1-(sqrt(21-4b-b^2))/(b+1))x^3+5x+sqrt6` is increasing at every point of its domain is

A

`[-7,-1]`

B

`[-6,-2]`

C

[2,2.5]

D

[2,3]

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