A standing army was first introduced in Medieval India by which of the following ruler?

Allauddin Khalji

The correct answer is Option 1- Allauddin Khalji

Alauddin Khilji introduced the first permanent standing Army of Medieval India.

The standing army was first introduced in Medieval India by Alauddin Khalji, the Sultan of Delhi from 1296 to 1316. He implemented significant military reforms, including the establishment of a standing army known as the "New Order" or the "Corps of Forty Thousand," which was a permanent military force paid by the state and maintained throughout the year, unlike the traditional feudal system where soldiers were called upon during times of war and disbanded during peacetime. Alauddin Khalji's military reforms strengthened the central authority and enabled the Sultanate to effectively defend its territories and expand its influence.