Gene regulation governing lactose operon of E. coli that involves the lac I gene product is
A. Negative and inducible because repressor protein prevents transcription
B. Negative and repressible because repressor protsin prevents trenscription
C. Feedback inhibition decause excess of ~beta`- galactosidase can switch off transcripyion
D. Positive and inducible because it can be induced by lactose
