With reference to soil conservation, consider the following practices:
1. Crop rotation 2. Sand fences 3. Terracing 4. Wind breaks
Which of the above are considered appropriate methods for soil conservation in India?
(a) 1, 2 and 3 (b) 2 and 4 (c) 1, 3 and 4 (d) 1, 2, 3 and 4