With reference to the Champaran Satyagraha (1917) and Bihar's role in the freedom movement, consider the following statements:

1. 1. At the time of the Champaran Satyagraha, the formal invitation to Mahatma Gandhi to come to Champaran was given by Rajkumar Shukla, who was a local farmer, and Gandhi's key associates in this movement included Dr. Rajendra Prasad, Brajkishore Prasad, Mahadev Desai, and Narhari Parikh.
2. 2. Following the passing of the Champaran Agrarian Act (1918), a specific percentage of the illegal fee extorted from farmers by European indigo planters (50 percent of the total illegal collection) was refunded.
3. 3. In the year 1922, the Gaya session of the Indian National Congress was held, which was chaired by Chittaranjan Das (C.R. Das), and during this very session, the framework for the formation of the Swaraj Party was prepared.
4. 4. During the Non-Cooperation Movement, leaders like Anugrah Narayan Singh, Mohammad Zubair, and Shah Muhammad Zubair actively participated in Bihar, and the Bihar National College and Sadaqat Ashram were established as centers of national education and freedom activities.

Which of the above statement(s) is/are completely true?