Match List-I with List-II and select the correct answer using the options given below:

List-I (Semiconductor Device)	List-II (Application)
a. Triac	1. Used in HVDC system
b. IGBT	2. Used in pulse generation
c. SCR	3. Used in motor control circuits
d. UJT	4. Used in ac regulators

A. a-1, b-3, c-4, d-2

B. a-4, b-2, c-1, d-3

C. a-1, b-2, c-4, d-3

D. a-4, b-3, c-1, d-2

Answer: Option A