With reference to medieval Indian rulers, which one of the following statement is correct? [2002]
1) Alauddin Khalji first set up a separate ariz
2) Balban introduced the branding of horses in his military.
3) Muhammad Bin Tughlaq was succeeded by his uncle to the military.
4) Firoz Tughlaq set up a separate department of slaves.
4) Firoz Tughlaq set up a separate department of slaves.