Answer : 2. "INS सह्याद्री "
Explanation :

1. The Indian Navy's indigenously built warship INS Sahyadri participated in the first trilateral maritime partnership exercise with the Royal Australian Navy (RAN) and the Indonesian Navy.

2. “The trilateral exercise provided an opportunity for the three maritime nations to strengthen their partnership and improve their collective capacity to support a stable, peaceful and secure Indo-Pacific region.