Match the following
| Circuit breaker (CB) | Arc extinction medium |
| 1. Minimum oil CB | a. Oil |
| 2. Air blast CB | b. Air at atmospheric pressure |
| 3. SF6 CB | c. SF6 gas |
| 4. Air break CB | d. Compressed air |
1
1 - a, 2 - b, 3 - c, 4 - d
2
1 - d, 2 - b, 3 - c, 4 - a
3
1 - c, 2 - b, 3 - a, 4 - d
4
1 - a, 2 - d, 3 - c, 4 - b