Dry farming is a type of agriculture that relies solely on natural rainfall for irrigation, without the use of artificial irrigation systems. In India, dry farming is extensively practiced in the Deccan Plateau.

The Deccan Plateau is a large plateau region in southern India, which includes parts of Maharashtra, Telangana, Karnataka, and Andhra Pradesh. It is characterized by a semi-arid climate, with low annual rainfall and a long dry season. Due to these climatic conditions, traditional farming with the use of artificial irrigation is not feasible.

Farmers in the Deccan Plateau have developed specific techniques to adapt to this arid environment. They use methods like moisture conservation, crop rotation, and selective crop choices that can withstand drought conditions. These techniques help them to maximize the productivity of their crops despite the limited water availability.

Therefore, option 2 - Deccan Plateau is the correct answer.