In the formation of a p-n junction diode, arrange the following processes in sequence.

(A) Diffusion of charge carriers
(B) Drift of charge carriers
(C) Doping
(D) Generation of electric field at the junction

Choose the correct answer from the options given below:

(C), (A), (D), (B)

The correct answer is Option (3) → (C), (A), (D), (B)

Correct sequence:

(C) Doping → (A) Diffusion of charge carriers → (D) Generation of electric field at the junction → (B) Drift of charge carriers 
First the semiconductor is doped to form p-type and n-type regions. After joining, charge carriers diffuse across the junction. This creates a built-in electric field in the depletion region, which then causes drift of charge carriers in the opposite direction until equilibrium is reached.