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If two roots of the equation (p-1)(x^2 +...

If two roots of the equation `(p-1)(x^2 +x +1)^2 -(p+1)(x^4+x^2+1)=0` are real and distinct and `f(x)=(1-x)/(1+x)` then `f(f(x))+f(f(1/x))` is equal to

A

(a) `p`

B

(b) `-p`

C

(c) `2p`

D

(d) `-2p`

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A
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