The Khilji Sultans of Delhi were not Mongols (option 1) or A Jat tribe (option 4). They were actually Afghans (option 2). The Khilji dynasty, which ruled Delhi from 1290 to 1320, was of Afghan origin. Jalaluddin Khilji was the founder of the dynasty, and he was succeeded by his nephew, Alauddin Khilji. The Khiljis rose to power after overthrowing the last ruler of the Slave dynasty, which had Turkic origins. Therefore, although the Khilji Sultans of Delhi were Islamic rulers, they were not Turks (option 3). It is important to note that the Khilji dynasty was known for its military conquests and administrative reforms, particularly during the reign of Alauddin Khilji.