Answer : 2. "अजीतसिंह "
Explanation :

1. Durgadas Rathore helped in installing Ajit Singh of Marwar on the throne. Ajit Singh was the son of Maharaja Jaswant Singh. After the death of Jaswant Singh, Aurangzeb did not accept his son Ajit Singh as the ruler of Marwar. He placed his puppet ruler Kirti Singh in control of Marwar.

  2. Veer Durgadas Rathore is called the savior of Marwar, Anabindiya pearl of Marwar, UNICEF of Rathores.

  3. Veer Durgadas Rathore was born on 13 August 1638 in Salwa village of Marwar princely state. Durgadas Rathore's father's name was Askaran who used to be the minister of Maharaja Jaswant Singh in Jodhpur court.

4. Even today in the history of Rajasthan, it is said about brave Durgadas Rathod that “Mai Aihadau Poot Jan, Jehdau Durgadas, Band Marudhara Rakhiyo Bin Khambha Aakash”.