Match List-I with List-II and select the correct answer using the options given below:
| List-I (Regions of bipolar transistor in monolithic IC) | List-II (Physical properties) |
| a. Emitter | 1. Moderate resistivity |
| b. Base | 2. Very high resistivity |
| c. Collector | 3. Large size |
| d. Substrate | 4. Very high conductivity |
A. a-1, b-4, c-2, d-3
B. a-4, b-1, c-2, d-3
C. a-4, b-1, c-3, d-2
D. a-1, b-4, c-3, d-2
Answer: Option C

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