Match the following blasting elements with the corresponding initiators.
| Blasting Elements | Initiators |
|---|---|
| P - Electric detonator | 1 - Match stick |
| Q - Safety fuse | 2 - Booster |
| R - Detonating fuse | 3 - Exploder |
| S - Non cap-sensitive explosive | 4 - Ordinary detonator |
P-2, Q-3, R-4, S-1
P-3, Q-1, R-4, S-2
P-3, Q-1, R-2, S-4
P-1, Q-4, R-2, S-3
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