After unloading, a driver sees a student bend near the right front wheel for a dropped phone. What is safest?

1. The bus may move while students are beside the bus if the stop arm is out
2. Dropped objects should be retrieved quickly before telling the driver
3. Keep the bus secured, stop student movement, regain the student's attention, and do not move until the student is visible and clear
4. Students should move as soon as they see the bus approaching