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Select the $\text{CORRECT}$ statement(s) regarding semiconductor devices.

1. Electrons and holes are of equal density in an intrinsic semiconductor at equilibrium.
2. Collector region is generally more heavily doped than Base region in a $\text{BJT}.$
3. Total current is spatially constant in a two terminal electronic device in dark under steady state condition.
4. Mobility of electrons always increases with temperature in Silicon beyond $300 \; \text{K}.$