Q .     Let z be a complex number satisfying `z^2 + 2alphaz + 1 = 0` where `alpha` is a parameter which can take any real value.
The roots of this equation lie on a certain circle if

JEE Advanced Paper 2
A

`-1 < alpha < 1`

B

`alpha > 1`

C

`alpha < 1`

D

None of these

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