Consider the following statements about the Indian Councils Act of 1861:

1. The Act reintroduced legislative powers to the provinces and introduced the idea of decentralization.
2. It allowed the Governor-General to appoint Indians as non-official members in the Council.
3. It granted complete autonomy to provincial governments in legislative matters.
4. The Act introduced the concept of a separate judiciary for British subjects in India.

Which of the above statements are correct?