Which of the following statements regarding Pala Dynasty is/are correct?

1. Pala rulers patronized Jainism and played an important role in establishing Jainism in different regions.

2. The first Bengali literary work Charyapada is attributed to the Pala Dynasty.

3. During the Pala era, Vikaramsila and Nalanda were established as two significant centres of learning.

Select the correct answer using the codes given below.