If Re((z-1)/(z+1))=0 where z=x+iy is a c...

If Re`((z-1)/(z+1))=0` where `z=x+iy` is a complex number, then which one of the following is correct? (a) `z=1+i` (b) `|z|= 2`. (c) `z=1-i`

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