With reference to soil conservation, consider the following

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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 ?

[UPSC CSE Prelims 2010]

1, 2 and 3 only

2 and 4 only

1, 3 and 4 only

1, 2, 3 and 4