With reference to medieval Indian rulers, which one of the following statement is correct

Q. With reference to medieval Indian rulers, which one of the following statement is correct?

(a) Alauddin Khilji first set up a separate ariz’s department.

(b) Balban introduced the branding of horses in his military.

(c) Muhammad Bin Tughlaq was succeeded by his uncle to the military.

(d) Firoz Tughlaq set up a separate department of slaves.

Ans: (d) Firoz Tughlaq set up a separate department of slaves.