The correct answer is option 3, Rishabhdev. Rishabhdev, also known as Lord Adinath, was the first Tirthankara of Jainism. Tirthankaras are spiritual teachers who have achieved enlightenment and guide others on the path of liberation. Rishabhdev is believed to have lived millions of years ago and is considered the founder of Jainism. He taught the principles of non-violence, truthfulness, and asceticism. The subsequent Tirthankaras, including Mahavir Swamy, Ajitnath, and Parshwanath, followed in Rishabhdev`s footsteps and further developed the Jain philosophy and teachings. It is worth noting that while Mahavir Swamy is a well-known figure in Jainism, he was the 24th and last Tirthankara, not the first.