Consider the following statements regarding Nalanda art:

1. It initially depended heavily on the Sarnath Gupta tradition.
2. By the ninth century, it synthesised Sarnath, Bihar and central Indian elements.
3. Its sculptures generally favour an ordered composition with little crowding and detailed back slabs.
4. Crowned Buddhas are common from the earliest Nalanda phase.

Which of the statements given above are correct?