What must a physician do if they wish to relinquish care according to the guidelines?

The correct option highlights the importance of ensuring that prehospital personnel adhere to established protocols when a physician decides to relinquish care. This is essential because adherence to protocols ensures continuity of care and the safety of the patient. The guidelines for transferring or relinquishing care typically require that proper procedures are followed, which may involve confirming that the incoming medical personnel, whether they are paramedics or other providers, are equipped to take over care.

The necessity for following established protocols also ties into the legal and ethical responsibilities of medical professionals. It helps to protect both the physician and the patient by systematically ensuring that care is not abruptly interrupted and that the patient's needs continue to be addressed effectively.

In contrast, remaining with the patient until a new physician arrives may not always be feasible, and transferring care solely to registered nurses might not align with all protocols, depending on the situation and the patient’s condition. Lastly, leaving the scene after simply advising paramedics could risk a lapse in care if there are no clear handoff procedures in place.