Option b is the correct answer The first true Islamic arch made its appearance in the tomb of Balban built around 1287-88. It has historical importance in the development of Indo-Islamic architecture. It is located at the archaeological park in Mehrauli. Important Tips Iltutmish's Tomb: The tomb of Iltutmish was built in 1235 A.D. It is situated just outside the north-west cornerof the Quwwat-ul-Islam near the Qutub Minar. Inside the tomb, there are three mihrabs (prayer niches). Alai Darwaza: It was constructed with a domeshaped gate made of red sandstone and decorated with stunning Turkic features made of white marble inlay and inscriptions engraved in the ancient Naskh Script and screens made with Lattice stones depicting unique Turkic craftsmanship. It was built by Ala-ud-din Khilji in 1311 AD. Quwwatul-Islam Mosque: Quwwat-ul-Islam was sponsored by Qutb-ud-din Aibak, founder of the Mamluk dynasty. The Quwwat-ul-Islam is best known for its tower of victory, celebrating the Muslim conquest of India.