The following sentences form a paragraph. These four parts are numbered as P, Q, R and S. They are not given in their proper order. Read the sentences and choose the alternative that arranges them in correct order.

P. Mohammad bin Tughlaq, who ruled from 1321 to 1351 as the Delhi Sultan, captured large parts of the Deccan including Gulbarga.

Q. The Bahmani Sultans ruled from here till the capital of the kingdom was shifted to Bidar in 1424.

R. Hasan built Gulbarga as a fortress city.

S. In 1347, a Tughlaq officer named Alauddin Hasan revolted against Tughlaq and declared his independence by establishing the Bahmani kingdom (1347-1527) with Gulbarga as its capital.