Discussion
What is the input impedance of a common-emitter stage with a bypassed emitter?
Answer: A
Looking into the base gives beta times the emitter resistance, and the bias divider appears in parallel with it - often dominating, since a stiff divider is deliberately made low. The third option applies when the emitter resistor is unbypassed. Remembering that the bias network is part of the signal path is what stops input impedance being overestimated by a wide margin.
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