Correct option is A
A bipolar junction transistor (BJT) functions effectively as an amplifier when operating in the Active Region. In this region, the transistor behaves as a linear device, where a small input current applied to the base terminal controls a proportionally larger current flowing between the collector and emitter terminals, thereby amplifying the signal.
The key biasing conditions for the active region are:
The base-emitter (B-E) junction is forward-biased.
The collector-base (C-B) junction is reverse-biased.
