Consider the following pairs with reference  to various dynasties of Sultanate period and  development of architectural features: Which of the above pairs are correctly matched?

• Pair 1 is correct: Under the Slave dynasty, the style of architecture came to be known as the Mameluke style of architecture. During this period, most of the constructions were remodeling of the existing Hindu structures. They also started the erection of a number of monuments, Qutub Minar being a prime example. • Pair 2 is correct: The Khilji dynasty established the Seljuk style of architecture. The constructions of this period were marked by the use of red sandstone. Also, the prominence of Arcuate style began from this period. Mortar began to be used prominently in all the constructions as a cementing agent. • Pair 3 is incorrect: Tughlaq dynasty was the crisis period for architecture. However, some construction works were still undertaken, which used grey sandstone. During this period, the focus was more on the strength of the building and so there was less emphasis on decoration. The constructions combined both arch and lintel method of entrance design. They also introduced a style of construction known as “batter” which was characterised by sloping walls to give more strength to the building. • Pair 4 is incorrect: Under the Lodi dynasty, architecture continued to take a back seat. Only tombs were commissioned during this period. However, one important feature of architecture during this period was the introduction of double domes. It consisted of a hollow dome inside the top dome. Extra Edge by PW OnlyIAS Arcuate style of architecture ● It is characterized by the use of arches and domes. It uses domes, generally hemispherical, on top of the mosques. Minars were also present on the four corners of the Mosques.