In the context of India, which of the following is/are considered to be practice(s) of sustainable agriculture?
1. Biodynamic farming
2. Laser land levelling
3. Intercropping
4. Conservation tillage
Select the correct answer using the code given below.
1
1, 2 and 3 only
2
3 only
3
3 and 4 only
4
1, 2, 3 and 4