What is the mandatory action when an emergency vehicle (police car, fire engine, ambulance) approaches with active sirens and flashing lights?

1. Maintain your lane and speed so the emergency vehicle can navigate around you
2. Yield the right-of-way immediately, pulling as far to the right side of the roadway as possible and stopping if necessary
3. Accelerate to lead the emergency vehicle through the intersection
4. Pull over to the left median on a two-way street