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`f : R -> R`, where `f(x)=(x^2+ax+1)/(x^2+x+1)` Complete set of values of 'a' such that `f (x)` is onto, is

A

`(-oo,oo)`

B

`(-oo,0)`

C

`(0,oo)`

D

None

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The correct Answer is:
D
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