What must you do when an emergency vehicle (vozilo sa prvenstvom prolaza) approaches with flashing blue lights and an active siren?

1. Immediately yield right-of-way, slow down, and pull as far to the right edge of the carriageway (or stop) as necessary to allow clear passage
2. Accelerate to stay ahead of the emergency vehicle
3. Stop immediately in the middle of an intersection
4. Move to the left shoulder on a two-way single-lane road