Answer : 3. "Sri Lanka"
Explanation :

The 8th edition of the joint military exercise, Yudh Abhyas Mitra Shakti, conducted between the Indian Army and the Sri Lankan Army from 04-16 October 2021 concluded today at Combat Training School, Ampara.

Exercise Mitra Shakti based on counter-terrorism and counter-insurgency operations in semi-urban areas is the largest bilateral exercise being conducted by the Sri Lankan Army and is a key part of the growing defense partnership between India and Sri Lanka. Both the contingents displayed great enthusiasm and professionalism during the joint exercises executed during the last 14 days.