Alert - correct answer should be Option 1.

The Mansabdari system was introduced by Akbar in medieval India and was central to the military and administrative system of the Mughal Empire.

Option 1 is correct. The Mansabdari system served as a way of recruiting to the army. Mansabdars were given ranks and were responsible for providing and maintaining a certain number of troops. Hence, this system was used to organize a large army consisting of cavalry, infantry, and artillery.

Option 2 is incorrect. While Mansabdars were sometimes tasked with revenue collection, this was not the primary aim of introducing the system.

Option 3 is incorrect. The Mansabdari system wasn`t specifically brought in to ensure religious harmony. While Akbar was known for his efforts towards religious tolerance, the Mansabdari system dealt mainly with military and administrative matters.

Option 4 is incorrect. While the Mansabdari system did bring some order in administration, its main purpose was not to effect clean administration but rather, to streamline military recruitment and control.