With reference to the religious history of India, consider the following statements:

1. Mahayana school of Buddhism believes in the heavenliness of Buddha and Idol worship of Buddha and Bodhisattvas embodying Buddha Nature.

2. Theravada Buddhism developed in Sri Lanka and subsequently spread to the rest of Southeast Asia. 

3. Vajrayana is grounded on esoteric elements and a very complex set of rituals compared with the rest of the Buddhist schools.

Which of the statements given above is/are correct?