Mutation of What Would Convert the Lac Operon to an OR Gate

Multiple Choice

Mutation of what would convert the lac operon to an OR gate?

A) An operator sequence,so that it was constitutive.
B) A cis-element so either inducer was sufficient for transcription.
C) An operon so that only lacZ or lacY was transcribed at any time.
D) The promoter so that it would not bind RNA polymerase.
E) The repressor so that it could not bind allolactose.