Which one of the following statements with regard to the Moidams, built by the Tai-Ahom kingdom and inscribed as a World Heritage Site by UNESCO, is/are correct ? 1. They acted as army fortresses. 2. They were recreation centres of the Royals and Nobles. 3. They were burial grounds of the Royals and Nobles. 4. They were battle drill centres of the Royals and Nobles. Select the answer using the code given below :