Match column-I with column-II and select the correct answer using the codes given below. Column-I Column-II A. Operator site I. Binding site for RNA polymerase B. Promoter site II. Binding site for repressor molecule C. Structural gene III. Codes for enzyme protein D. Regulator gene IV. Codes for repressor molecules

• A. A-II;    B-I;     C-III;    D-IV
• B. A-II;    B-I;     C-IV;    D-II I
• C. A-IV;   B-III;   C-I;      D-II
• D. A-II;    B-III;   C-I;      D-IV