If z1 and z2 are two complex numbers for...

If `z_1 and z_2` are two complex numbers for which `|(z_1-z_2)(1-z_1z_2)|=1 and |z_2|!=1 then` (A) `|z_2|=2` (B) `|z_1|=1` (C) `z_1=e^(itheta)` (D) `z_2=e^(itheta)`

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