If the cubic polymomial y = ax ^(3) + bx...

If the cubic polymomial `y = ax ^(3) + bx^(2) +cx+ d (a,b,c,d inR)` has only one critical point in its entire domain and `ac=2,` then the value of `|b|` is:

A

`sqrt2`

B

`sqrt3`

C

`sqrt5`

D

`sqrt6`

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The correct Answer is:

D

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