With reference to medieval Indian rulers, which one of the following statements is correct?
- (a)Alauddin Khalji first set up a separate Ariz's department
- (b)Balban introduced the branding system of horses of military
- (c)Muhammad bin Tughlaq was succeeded by his uncle to the Delhi throne
- (d)Firuz Tughlaq set up a separate department of slaves
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Official answer(d) Firuz Tughlaq set up a separate department of slaves