Who was the first sultan of Delhi Sultanate to set up a permanent standing army?

Who was the first sultan to set up a permanent standing army of Delhi Sultanate?
A) Muhammad Tughlaq
B) Iltutmish
C) Balban
D) Alauddin Khilji
Answer: Alauddin Khilji

Alauddin Khalji was second and the most powerful ruler of the Khalji dynasty.

Market Regulation is the one of the major reform introduced by Alauddin Khilji

Who was the Predecessor of Alauddin Khalji?
Jalaluddin Firuz Khalji

Who was the successor of Alauddin Khalji?
Shihabuddin Omar