How many of the following statements are true w.r.t. Lac operon?
(a) In the presence of an inducer, the repressor is inactivated by interaction with the inducer. 
(b) Inducer may be lactose or allolactose in lac operon
(c) RNA polymerase cannot access the promoter in the presence of inducer.

• A

  a and b only

• B

  b and c only

• C

  a and c only

• D

  a, b and c