The correct answer is: Dharam Nath.
Rishabhnath Tirthankar was the first Tirthankar of the present Avasarpini (a cycle of time in Jainism). He was born in Ayodhya, the capital of the Ikshvaku dynasty, to King Nabhiraja and Queen Marudevi. He was named Rishabhnath by his father, which means “the one who is the lord of dharma”.
Dharma is a Sanskrit word that means “law, duty, virtue, righteousness”. In Jainism, dharma is the path to liberation from the cycle of rebirth. It is a code of conduct that includes non-violence, truthfulness, non-stealing, chastity, and non-possession.
Rishabhnath Tirthankar was a great teacher and preacher. He taught the importance of dharma and how to live a life of virtue. He also taught about the nature of reality and the cycle of rebirth.
Rishabhnath Tirthankar attained moksha (liberation) after a long and arduous journey. He is considered to be the first Tirthankar of the present Avasarpini and is one of the most important figures in Jainism.
The other options are incorrect because they are not the names that were given to Rishabhnath Tirthankar by his father Nabhiraya.
Anantnath is the name of the 24th Tirthankar of the present Avasarpini.
Chandra Prabhu is a name that is sometimes used to refer to Rishabhnath Tirthankar. However, it is not the name that was given to him by his father Nabhiraya.
Nabhisunu is the name of Rishabhnath Tirthankar’s son.