1st option is correct. 

About the territorial extent of the Sultanate of Delhi under Sultan Nasir-ud-din Mahmud, it was said that “the rule of the Lord of the world extends from Delhi to Palam” (about 9 miles).

Nasir ud din Mahmud, Nasir ud din Firuz Shah (reigned: 1246–1266) was the eighth sultan of the Mamluk Sultanate (Slave dynasty). He was the son of Nasiruddin Mahmud (died 1229), who was the eldest son of Shams ud din Iltutmish (1211–36) and was said to succeed his father but died suddenly; however, he did become the governor of Bengal. He was named after his father, by Shams ud din Iltutmish, for he had grown an intense filial attachment, to the only begot son of his posthumous child. He was also the nephew of Razia Sultan.