Correct choice is (b) I^+ + P + O^C + Z^– + Y^+ + A^+ / I^+ + P+ O^+ + Z^– + Y^+ + A^+
Explanation: This is because although this operon is constitutively turned on, yet it has a mutated lac Z gene which produces beta galactosidase. This mutation exists in both of the loci so it can’t produce this enzyme even if the operon is on.