Select the $\text{CORRECT}$ statement(s) regarding semiconductor devices.
- Electrons and holes are of equal density in an intrinsic semiconductor at equilibrium.
- Collector region is generally more heavily doped than Base region in a $\text{BJT}.$
- Total current is spatially constant in a two terminal electronic device in dark under steady state condition.
- Mobility of electrons always increases with temperature in Silicon beyond $300 \; \text{K}.$