The value of x for which the polynomial ...

The value of x for which the polynomial `2x ^(3) - 9x ^(2) + 12 x + 4` is a decreasing function of x, is :

A

`-1 lt x lt 1`

B

`0 lt x lt 2`

C

`x gt 3`

D

`1 lt x lt 2 `

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The correct Answer is:

D

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