Which of the following statements about Srimanta Shankardeva is/are correct? 1. In the late fifteenth century Shankardeva emerged as one of the leading proponents of Vaishnavism in Assam. 2. He was the founder of Gaudiya Vaishnavism. 3. His teachings are known as Bhagavati Dharma. 4. He encouraged the establishment of satra and naam ghar.