In the context of Zero Budget Natural Farming, consider the following statements.

1. 'Zero Budget' means farming with Nature and without chemicals.

2. The concept is different from organic farming, which is to ensure that profit from supplementary crops is enough to cover the cost of production of the main crop.

3. It has attained wide success in Northern India, especially the Northern Indian states of Punjab and Himachal Pradesh where it first evolved. 

4. The movement was born out of the efforts of Padma Shri Subhash Palekar.

Which of the statements given above is/are correct?