The lac repressor (I? gene product)controls the expression of structural genes located where?

A) Cis to the lacI⁺allele
B) Trans to the lacI⁺ allele
C) Cis to the lacO⁺ allele
D) Cis to the lacI⁺ allele and Trans to the lacI_^- allele
E) All of these are correct.