Discussion
What does a coupling capacitor do in an amplifier?
Answer: A
A coupling capacitor lets the signal through while keeping one stage's quiescent voltages from disturbing the next, which is what allows each stage to be biased independently. Removing the emitter resistor is the bypass capacitor's job, the high-frequency limit comes from junction and stray capacitances, and supply decoupling is a third function. Three capacitors doing three quite different jobs in one stage is worth keeping straight when reading a schematic.
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