The Gangetic Plain as an agro-climatic region is divided into the following subregions:
1. Upper and Lower Gangetic Basin
2. Lower, Middle, Upper and Trans-Gangetic Plain
3. Lower, Upper and Trans-Gangetic Plain
4. Upper and Trans-Gangetic plain
Select the correct answer from the codes given below
1
1, 2 and 3
2
only 2
3
only 3
4
2 and 4