which of the following is not a boundary guideline that school staff members and coaches should follow?

The guideline that is NOT a boundary guideline that school staff members and coaches should follow is: "Don't meet in classrooms with windows in the doors so you don't violate student privacy." In fact, meeting in classrooms with windows in the doors is encouraged to ensure transparency and safety, rather than being something to avoid. Other valid boundary guidelines include never engaging students in conversations about their romantic or sexual activities, not making a habit of meeting students outside of school, and never remaining alone with a student behind a closed door. These are all aimed at maintaining professional boundaries to protect students and staff alike.