How much airspace does a TFR normally cover when it protects persons and property or relief aircraft?

1. 1Within 500 feet above the surface and within a 1 NM radius
2. 2Within 5,000 feet above the surface and within a 10 NM radius
3. 3Within 2,000 feet above the surface and within a 3 NM radius
4. 4Within 18,000 feet MSL and within a 25 NM radius

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 3-5-3 Temporary Flight Restrictions, page 196