Catabolite Activator Protein (CAP) Increases Transcription from the Lactose Operon

Catabolite activator protein (CAP) increases transcription from the lactose operon by

A) binding lactose which releases the repressor from the operator.
B) directly increasing free cellular cAMP concentrations.
C) binding the operator and competing for repressor binding.
D) stabilizing the binding of RNA polymerase to the promoter.
E) preventing the degradation of RNA polymerase.