When Does the Release of Corticotropin-Releasing Factor (CRF) Stop

When does the release of corticotropin-releasing factor (CRF) stop?

A) When the level of cortisol in the blood adequately meets the body's metabolic needs
B) When the adrenal gland begins releasing cortisol into the blood
C) When adrenocorticotropic hormone production begins in the pituitary gland
D) When the level of adrenocorticotropic hormone in the blood reaches the maximum levels possible