The sub-committee headed by Gopinath Bordoloi, appointed by the Constituent Assembly of India to prepare the Constitution of India, made the following recommendations:

1. Fifth Schedule for the North-East Frontier (Assam) Tribal and Excluded Areas: This recommendation suggests the inclusion of a fifth schedule in the Constitution specifically for the tribal and excluded areas of Assam. The fifth schedule provides for the establishment of autonomous councils with special powers and provisions for the administration and development of these areas.

2. Constitution of District Councils in all autonomous districts of Assam: This recommendation proposes the formation of district councils in all autonomous districts of Assam. These councils would have certain administrative and legislative powers to govern the local affairs of each district, ensuring a more participatory and decentralized governance system.

3. Sixth Schedule for the North-East Frontier (Assam) Tribal and Excluded Areas: This recommendation advocates for the inclusion of a sixth schedule in the Constitution, specifically for the tribal and excluded areas of Assam. The sixth schedule grants significant autonomy to these areas, allowing them to have their own regional councils and executive powers to manage their social, economic, and cultural issues.

Therefore, the correct answer is option 3 (2 and 3 only), as the sub-committee