Which of the following statements are correct regarding Mahavira and Jainism?

1. Mahavira was born into a Kshatriya family.
2. The Jain doctrine of Ahimsa strictly forbids violence of any form, including verbal and mental.
3. Jainism emphasizes the transmigration of soul, but denies the existence of gods.
4. Mahavira is believed to be the 24th Tirthankara.