For a transistor to be used as an amplifier its input and output regions should be biased respectively in:

Forward and reverse biasing

The correct answer is Option (1) → Forward and reverse biasing

For a transistor to function as an amplifier, its input and out regions must be biased as follow-

(A) Input Region - forward biased

This insures that the base-emitter junction conducts and allows a small base current to control a large collector current.

(B) Output Region - Reverse Biased

This ensures that the collector-bias junction remains in active region, enabling the transistor to amplify the input signal.