Concerning the administration and significance of Agrahara and Matha, examine the following statements:

1. Agrahara lands were often administered by the recipient Brahmins who were responsible for religious and ethical duties.
2. Mathas were headed by religious leaders known as 'Mahants' or 'Swamis'.
3. Both Agrahara and Matha contributed to the centralization of political power by supporting the ruling dynasties.
4. Agrahara grants were temporary and would revert to the state after a fixed period.

Which of the statements given above are correct?