Which of the following statement supports the claim that RNA polymerase has a low affinity for Plac, the lac operon promoter?
a. High levels of expression of the lac operon requires binding of the CRP activator to CBS.
b. High levels of expression of the lac operon requires binding of the LacI repressor to the operator.
c. High levels of expression of the lac operon requires binding of glucose to the CRP activator.
d. High levels of expression of the lac operon requires binding of lactose to the LacI repressor.