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If all the roots of z^3-az^2+bz+c=0 are ...

If all the roots of `z^3-az^2+bz+c=0` are of unit modulus, then (A) `|3-4i+b|gt8` (B) `|c|ge3` (C) `|3-4i+a|le8` (D) none of these

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