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If f:R in R is defined by f(x)=(x^(2)-...

If `f:R in R` is defined by
`f(x)=(x^(2)-ax+1)/(x^(2)+ax+1),0ltalt2`, the which of the following is true:

A

`(2 + a)^2 f'' (1) + (2 -a)^2 f'' ( -1) = 0`

B

`(2-a)^2 f'' (1) - (2 + a)^2 f'' (-1) = 0`

C

`f'(1) f' (-1) = (2 - a)^2`

D

`f'(1) f'(-1) = -(2 + a)^2)`

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