Discussion
What is the cost of making the bias divider very stiff?
Answer: C
Lower divider resistances waste more supply current and load the signal source, since the divider appears in parallel with the input. The gain and the stability factor both improve or stay the same, and the bypass capacitor depends on the emitter resistance rather than the divider. Stiffness is bought with current and input impedance, which is why the tenth-of-beta rule is a compromise rather than an ideal. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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