Consider the following statements about the theocratic and theocentric nature of the Delhi Sultanate:

1. The Delhi Sultanate incorporated Sharia as a central component of its legal system.
2. Hindu subjects were taxed under Jaziya while Muslim subjects were exempt.
3. The Sultan held supreme power but relied on religious clerics to legitimize his rule.
4. The Sultanate adopted Hindu principles in administration to integrate the local population.

Which of the statements are correct?