Match the following in the context of environmental management.
| Technique | Purpose |
|---|---|
| P - Mulching | 1 - Dust control |
| Q - Aeration | 2 - Noise control |
| R - Wet-scrubbing | 3 - Soil conservation |
| S - Silencer | 4 - Waste water treatment |
P-1, Q-4, R-3, S-2
P-3, Q-1, R-4, S-2
P-4, Q-3, R-1, S-2
P-3, Q-4, R-1, S-2
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