Which of the following statements is true?

The lac repressor binds with lactose and transcription occurs when both glucose and lactose are present in the cell.

When both glucose and lactose are absent, transcription occurs.

In the absence of glucose, when lactose is present, it combines with the repressor, allowing RNA polymerase to carry on transcription.

When glucose is present, cyclic AMP is high, CAP does not bind to the activator binding site and transcription of lactose is turned on.