Consider the following statements regarding the British economic policies in India:

 

1. The British introduced the Ryotwari system in South India, ensuring direct revenue collection from peasants.
2. The Permanent Settlement created a class of zamindars who acted as revenue collectors.
3. The Drain Theory proposed by Dadabhai Naoroji explained how British economic policies drained wealth from India to Britain.
4. The British heavily invested in promoting indigenous industries during the 19th century.

Which of the statements are correct?