Discussion
What penalty does heavy overdrive impose on a switching transistor?
Answer: D
Overdrive fills the base with excess stored charge, and that charge must be removed before the device can begin to turn off, which appears as storage delay. The saturation voltage actually falls slightly with more drive, and neither leakage nor breakdown voltage is affected. The remedy is a Schottky clamp or a speed-up capacitor, both of which prevent the device from saturating deeply - a good example of designing around a limit rather than accepting it.
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