For transistor action, which of the following statements are correct:

(A) The base region must be very thin and lightly doped
(B) Base emitter and collector regions should have same size but different doping concentration
(C) The collector junction is reverse biased and emitter junction is forward biased
(D) Base, emitter and collector regions should have different sizes, but same doping concentration
(E) Both the emitter junction as well as the collector junction are forward biased

Choose the correct answer from the options given below:

(A) and (C) only

The correct answer is Option (1) → (A) and (C) only

For proper action of transistor:

• The emitter section should be forward biased while the collector section should be reverse biased.
• Base is thin and lightly doped
• Emitter size is moderate (larger than base) but slightly smaller than collector (due to heat dissipation from collector region)