History · Delhi Sultanate

With reference to the iqta system under the Delhi Sultanate, consider the following statements: I. Iqtas were transferable revenue assignments granted in lieu of cash salaries. II. The muqti was entitled to retain the surplus revenue after meeting administrative and military expenses. III. Under Alauddin Khalji, strict measures were introduced to prevent hereditary control over iqtas. Which of the statements given above are correct?