Statement 1 is correct: India's linguistic diversity is indeed categorized into four major families: Indo- Aryan, Dravidian, Austric, and Sino-Tibetan. Statement 2 is correct: These are the four generally accepted primary linguistic families present in India. Statement 3 is correct: The major languages spoken in South India, such as Tamil, Telugu, Kannada, and Malayalam, belong to the Dravidian linguistic family. Statement 4 is incorrect: Kashmiri, Sindhi, and Gujarati languages belong to the Indo-Aryan family, not the Austric family. The Austric family in India includes languages spoken by tribal communities, such as Santali, Mundari, Ho, etc.