Consider the following statements about Dara Shikoh.
1. Dara Shikoh was the son of Shah Jahan and brother of Aurangzeb.
2. His best known work was a study of Sufi and Vedanta philosophy.
3. He also translated the Upanishads into Persian in 1657.
4. He was killed in the fight for the throne between him and his brother Aurangzeb.
Which of the statements given is/are correct?