Discussion
Why do some designs use a separate higher supply for the driver stage?
Answer: C
The driver must sit a couple of volts above the output device's base to keep it conducting, so a supply a few volts higher than the output rail lets the output reach much nearer to that rail. Output dissipation, supply rejection and coupling are not what it addresses. It is the same problem bootstrapping solves, taken by a different route, and the choice between them is one of cost against complexity.
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