Consider the following architectural characteristics of the Sultanate period in India:

1. Use of intricate jali work to create screens that allow light and air into buildings while maintaining privacy.
2. Integration of Persian architectural elements, including large domes and minarets, into mosque design.
3. Employment of the hammam or bathhouse in palace complexes, reflecting the Islamic emphasis on cleanliness.
4. Construction of monumental tombs, such as the Tomb of Iltutmish, demonstrating the transition from Hindu temple architecture to Islamic funerary structures.

Which of the statements are correct?