Which of the following contributions are attributed to Bhai Gurdas?

1. He completed the Adi Granth in 1604, taking nearly 19 years to scribe.
2. His Punjabi works are collectively called Vaaran Bhai Gurdas.
3. His writings include 40 Vaars containing 912 Pauris in Punjabi.
4. He wrote Sassi Punnu, one of Punjab’s famous love stories.

Which of the above statements are correct?