If z= frac{4}{1-i}, then barz is (where ...

If `z= frac{4}{1-i}`, then `barz` is (where barz is complex congugate of z)

A

`A.2(1+i)`

B

`B.(1+i)`

C

`C.frac{2}{1-i}`

D

`D.frac{4}{1+i}`

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