Answer:None of the above
Step-by-step explanation:
Lactose operon is also called lac operon it is a protein that allows for breakdown and metabolism of lactose when glucose is not available. Glucose is the main carbon source but when it is not available, lactose is been broken down for metabolism activity.
lac operon helps in effective digestion of lactose through the activity of beta-galactosidase.
Beta galactosidase is a gene product of lacZ which cleaves lactose, into glucose and galactose.