For transistor action, which of the following statements are correct

A. Both the emitter junction as well as the collector junction are forward biased.
B. The base region must be very thin and lightly dopped.
C. Base, emitter and collector should have same doping concentration.
D. The emitter junction is forward and collector junction is reverse bias.

Choose the correct answer from the options given below:

B and D only

The correct answer is Option (4) → B and D only

(B) In a transistor, the base region is typically very thin and lightly doped to ensure that the majority of charge carries can pass through it easily.

(D) In active mode of a transistor, the emitter junction is forward biased, while the collector junction is reverse biased.