Option a is the correct answer. Statement 1 is correct. In the revenue administration of Delhi Sultanate, the in-charge of revenue collection was known as 'Amil'. Statement 2 is incorrect. Iqta system was not an ancient indigenous Indian institution. In India, it was started during the rule of Delhi sultanates itself. Under Iqta System, the land of the empire was divided into several large and small tracts called Iqta and assigned these Iqtas to his soldiers, officers and nobles. Statement 3 is incorrect. Mir Bakshi was Head of the military department. The office of 'Mir Bakshi' came into existence during the reign of Mughals.