You Are Studying Regulation of a Prokaryotic Operon

You are studying regulation of a prokaryotic operon. Experimental results show that expression of the operon is increased when product levels are low. Based on this information, you conclude that the likely mode of regulation is

A) the operon is ON in the absence of its regulatory protein.
B) the operon is OFF in the absence of its regulatory protein.
C) the presence of an inducer will always cause a repressor to bind the operator.
D) the presence of an inducer will always prevent a repressor from binding the operator.