What is the primary difference in the driving mechanism between a supercharger and a turbocharger?

1. A supercharger is driven mechanically by the engine's crankshaft via a belt/gear, whereas a turbocharger is driven by the kinetic energy of exhaust gases.
2. A turbocharger is driven by the crankshaft, whereas a supercharger is driven by exhaust gases.
3. A supercharger is electrically driven, while a turbocharger is hydraulically driven by engine oil.
4. There is no difference; both are driven by the crankshaft but operate at different speeds.