Option c is the correct answer. The Mansabdari system was a system of ranking and salary for the military and civil officers of the Mughal administration. It was introduced by Akbar in 1571 as a reform of the jagirdari system. The Mansabdari system was not an original invention of Akbar, but it was influenced by the Central Asian institution of the same name. The word mansab is of Arabic origin meaning rank or position. The system originated from the Mongol ruler Chinggis Khan, who organized his army on a decimal basis. The lowest unit of his army was ten, and the highest ten thousand (toman) whose commander was known as 'Khan'.