The nursing supervisor overhears a nurse discussing the Health Insurance Portability and Accountability Act (HIPAA) guidelines with a group of nursing students. Which statement by the nurse prompts the nursing supervisor to intervene immediately?

What is the role of PEEP (positive end expiratory pressure) in managing mechanically ventilated patients? 

The nurse has observed the resident physician move between patients without performing hand hygiene on multiple occasions. Each time, the nurse asks the resident physician to perform hand hygiene before moving on to the next patient; the resident physician scoffs at the nurse and continues examining patients. Which action by the nurse is most appropriate?