Who was the military chief of Velunachiyar's army?
12. Consider the following statements about Delhi sultanate
i) Wazir was the head of revenue department
ii) Ariz-i-mamalik was the head of military department
iii) Ariz-i-mamalik was the commander in chief of the army
iv) Qazi was the head of the department of justice
Identify the incorrect statement/s