After an impact or crash in which the helmet strikes the ground or a hard object, what must be done with the helmet?

1. Repaint the outer shell and continue using it indefinitely
2. Replace it immediately, because the internal Expanded Polystyrene (EPS) foam liner crushes to absorb impact and cannot recover its shock-absorbing capability
3. Wash it with boiling water to restore the foam
4. Use it for another 10 years