Q.  With reference to the soil conservation, consider the following practices:1. Crop rotation2. Sand fences3. Terracing4. Wind breaksWhich of the above are considered appropriate methods for soil conservation in India?

1. 1, 2 and 3 only
2. 1, 3 and 4 only
3. 2 and 4 only
4. 1, 2, 3 and 4