The correct answer is option-4, Bangladesh. India recently signed a land boundary agreement with Bangladesh. This agreement is significant as it aims to resolve the longstanding boundary disputes and simplify the process of exchanging territories between the two countries. The agreement included the exchange of enclaves, which are small pieces of land surrounded by the territory of another country. The enclaves were transferred to the country they were physically connected to, resulting in a more streamlined and coherent border between India and Bangladesh. This agreement has helped improve relations and cooperation between the two neighboring countries and has been considered a milestone in resolving border issues in the region.