The correct answer is: Revenue collection system.
A zamindari was a type of revenue collection system in India under which a large landholder, known as a zamindar, was responsible for collecting taxes from the peasants who lived on his land and then paying a fixed sum to the government. The zamindari system was introduced by the Mughals in the 16th century and continued under British rule until it was abolished in 1950.
A princely state was an independent state ruled by a prince or princess. Princely states were common in India before and during British rule. After India gained independence in 1947, the princely states were merged into the Indian Union.
A fort is a fortified building or structure. Forts are often used for military purposes, but they can also be used for other purposes, such
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