The correct answer is option 2, Vajji. Vajji was a republic that existed during the 6th century B.C. It was not a centralized state but a confederacy of tribes in ancient India. The Vajji republic was located around the present-day Bihar region in India. The Vajji confederacy was governed by a council of representatives from various tribes and had a democratic system of governance. Their government structure was based on the principles of equality and collective decision-making. The Vajji republic was known for its strong military and administrative capabilities. It played a significant role in the political landscape of ancient India and was often mentioned as one of the Mahajanapadas, or great kingdoms, of that time.