Option c is the correct answer. Nasir-ud-Din Mahmud Shah Tughluq, also known as Nasiruddin Mahmud, was the last ruler of the Tughluq dynasty to govern the Islamic Delhi Sultanate. He ascended the throne in 1394 after a succession dispute with Nusrat Shah. His reign faced the invasion of Timur in 1398, resulting in the capture of Delhi and the looting of its treasures. This event marked the decline of the Tughluq dynasty, and Nasiruddin Mahmud's rule came to an end in February 1413. He was succeeded by Khizr Khan of the Sayyid dynasty.