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If f(x)=(p^2-1)/(p^2+1) x^3-3x + log 2 i...

If `f(x)=(p^2-1)/(p^2+1) x^3-3x + log 2` is a decreasing function of x.in, R then the set of possible values of p (independent of x) is

A

`[-1,1]`

B

`(1,oo)`

C

`(-oo,1]`

D

`(2,oo)`

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The correct Answer is:
A
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