When a p-n junction diode is reverse biased the flow of

When a p-n junction diode is reverse biased the flow of current across the junction is mainly due to

1. diffusion of charges
2. drift of charges
3. depends on the nature of material
4. both drift and diffusion of charges

When p-n junction is reverse biased, the flow of current is due to drifting of minority charge carriers across the junction.