explain permanent settlement , munro system and mahalwari system. please answer fast! thankyou!

Permanent settlement - To ensure a regular income , the company decided to fix the land on a permanent basis. This scheme was introduced in 1793 by Lord Cornwallis and came to know permanent settlement.

Munro system- In Munro system the farmer was recognized as the owner of the land.The company made a revenue settlement directly with the peasants.Thomas Munro developed this system. So it is known as Munro system.

Mahalwari system-In Mahalwari system land was commonly owned by a group of villages called Mahals.The task of collecting the revenue and paying it to the company was given to the headman of each Mahal.