Consider the following statements about the sources of modern Indian history:

1. Archival materials include records from the East India Company, Indian National Congress, and official government documents.
2. Biographies and memoirs provide subjective accounts that need corroboration with other sources for historical accuracy.
3. Oral evidence is primarily used to understand the perspectives of the educated class in colonial India.
4. Newspapers and creative literature became important tools for social and political awakening in the late 19th century.

Which of the statements are correct?