Consider the following statements with reference to the Post-Mauryan period of history.

1. After Ashoka’s death, the Mauryan empire disintegrated and the vast empire fractured away.

2. Pushyamitra of Shunga dynasty made Pataliputra his capital and thwarted attacks of Greek kings.

3. The reign of Pushyamitra Shunga has been described in Malaviagnimitram by Bhasa, including an account of Rajasuya sacrifice.

4. The Sungas patronised Sanskrit language, as well as art and architecture.

Which of the above statements is/are not correct?