4. Consider the following statements:  1. The last Mauryan ruler, Brihadratha was assassinated by his commander-in-chief, Pushyamitra Sunga. 2. The last Sunga king, Devabhuti was assassinated by his Brahmana Minister Vasudeva Kanva who usurped the throne. 3. The last ruler of the Kanva dynasty was deposed by the Andhras. Which of these statements is/are correct?