A teenage boy called 911 to report he accidentally shot his friend in the head if there is a full address display, which of the following is most important action to take

1. "Is the friend conscious and breathing Provide immediate instructions for first aid and emergency medical assistance."
2. "Instruct the teenager to secure the firearm, ensuring it is unloaded and away from anyone else in the area."
3. "Ask the teenager to stay on the line and provide a detailed description of the location and any potential hazards for responding emergency personnel."
4. "Advise the teenager not to leave the scene and to comply with any instructions from law enforcement when they arrive."