The correct answer is option 1: Persian. Persian was the official language of the Sultanate. The Sultanate was an Islamic kingdom that existed in India from the 13th to the 16th century. Persian, also known as Farsi, was widely used as the administrative and court language during this time. It was the language of the rulers and the elite class. Persian literature, art, and culture also flourished during the Sultanate period. Urdu, on the other hand, developed as a language during the later Mughal period, which came after the Sultanate. Arabic was the religious language of Islam, but it was not the official language of the Sultanate. Hindi, although spoken by the common people, did not hold official recognition during this time.