Why do fuses usually have lower voltage ratings for DC than for AC?

1. Because with AC, arcs in the fuse are extinguished at the first zero-crossing of the AC waveform
2. Because DC voltage is more dangerous and requires more insulation
3. Because of the non-alternating current, DC current exerts one-sided strain on the fuse
4. Because the root mean square of the voltage counts and that is lower for DCCorrect