Explanation:

Statement 1, 2 and 3: Alauddin Khalji maintained a large permanent standing army and paid them in cash from the royal treasury.He introduced the system of dagh (branding of horses) and prepared huliya (descriptive list of soldiers).In order to ensure maximum efficiency, a strict review of army from time to time was carried out.
Statement 4: The introduction of paying salaries in cash to the soldiers led to price regulations popularly called as Market Reforms.Markets were under the control of a high officer called Shahna-i- Mandi. The supply of grain was ensured by holding stocks in government store-houses.Regulations were issued to fix the price of all commodities.
Learning: Every merchant was registered under the Market department. There were secret agents called munhiyans who sent reports to the Sultan regarding the functioning of these markets.Violation of regulations was severely punished. Harsh punishment was given if any shopkeeper charged a higher price, or tried to cheat by using false weights and measures. Even during the famine the same price was maintained.