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Which of the following is (are) correct?...

Which of the following is (are) correct? (A) `bar(z_1-z_2)-a(barz_1-barz_2)=0` (B) `bar(z_1-z_2)+a(barz_1-barz_2)=0` (C) `bar(z_1-z_2)+a(barz_1-barz_2)=-b` (D) `bar(z_1-z_2)+a(barz_1-barz_2)=-b`

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