Which of the following statements accurately describes when brain death criteria is met in a potential organ donor?

A. The client's heart is still beating and they can breathe on their own. Brain death criteria specifically require the total and irreversible cessation of all brain functions, including the brainstem. A client who can breathe spontaneously has an intact brainstem and does not meet the legal definition of brain death. The apnea test must confirm the absence of spontaneous respirations for the diagnosis to be valid. B. The client's vital organs are no longer functioning and cannot be used for transplantation. Brain death is the preferred state for organ donation because the vital organs are kept perfused by artificial means. If the heart and lungs have already failed naturally, the organs quickly become ischemic and unusable for transplant. Brain death allows for the harvesting of healthy organs while the body is mechanically supported. C. The client's brain has irreversible damage and they are being maintained on life support. Brain death is defined as the irreversible loss of all functions of the entire brain, including the brainstem. Even though the heart is beating due to a ventilator providing oxygen, the person is legally and clinically dead. This allows for the initiation of the organ procurement process while biological tissue viability is maintained. D. The client is able to respond to stimuli and communicate with others. Any response to external stimuli or purposeful movement indicates that the cerebral cortex or brainstem is still functioning. Brain death requires a completely non-responsive state with no pupillary, corneal, or gag reflexes. Communication is entirely impossible once the neurological criteria for brain death have been met by two independent physicians.