Which of the following most accurately states the "firefighter's rule" in relation to injuries sustained by a professional firefighter when responding to an emergency?
1. A professional firefighter cannot file a lawsuit for injuries sustained while responding to an emergency.
2. A professional firefighter cannot be held liable for any injuries they sustain while responding to an emergency.
3. A professional firefighter cannot claim workers' compensation for injuries sustained while responding to an emergency.
4. A professional firefighter cannot receive disability benefits for injuries sustained while responding to an emergency.