The four regulations that are also know as reforms for making his reign free from rebellions are:
1. Revenue reforms
2. Market reforms
3. Military reforms
4. Social reforms
After Mongol invasions Alauddin, who was the most powerful ruler of Delhi Sultanate, had to make four important reforms, that touched agriculture and taxing, army, market goods and since Islam banned alcoholic drinks, then social reforms were also needed.
b. 1917
c. 1960
d. 1962