How does the presence or absence of glucose affect transcription regulation by the CAP-cAMP complex?

In the presence of glucose, high levels of cAMP allow CAP-cAMP complex formation, enhancing transcription.

Absence of glucose leads to low cAMP levels, preventing CAP-cAMP complex formation and hence reducing transcription.

In the absence of glucose, increased cAMP forms more CAP-cAMP complexes, promoting transcription.

The CAP-cAMP complex is unaffected by glucose levels.