Correct Answer: (a) Balban
Solution:Balban (1266-1286 CE) was undoubtedly one of the main architects of the Delhi sultanate, particularly of its form of government and institutions. He separated Diwan-i-wizarat (Finance Department) and created a new Department Diwan-i-Arz (Military Department). He then reorganised the Diwan-i-Arz and deployed the army in different parts of the kingdom to put down the rebellion.