A transistor is used in common emitter m...

A transistor is used in common emitter mode as an amplifier. Then
(1) the base-emitter junction is forward biased
(2) the base emitter junction is reverse biased
(3) the input signal is connected in series with the voltage applied to the base-emitter junction.
(4) the input signal is connected in series with the voltage applied to the base collector junction.

A,B

A,D

A,C

only C

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