In the context of India, which of the following is/are considered to be practice(s) of eco-friendly agriculture?1.Crop diversification2.Legume intensification3.Tensiometer use4.Vertical farmingSelect the correct answer using the code given below:

1. A

   1, 2 and 3 only

   1, 2 and 3 only. Crop diversification, legumes, tensiometers — eco-friendly as keyed. Vertical farming is not counted in this trio.

2. B

   3 only

   3 only. Under-counts.

3. C

   4 only

   4 only. Vertical farming is the dropped limb.

4. D

   1, 2, 3 and 4

   All four. Vertical farming is not keyed with the other three.

Summary. Official key is (a) 1, 2 and 3 only. Diversification, legume intensification and tensiometer-guided irrigation are the eco-friendly set. Vertical farming is not in the official four.