Which of the following was the capital of Sikh rule founded by Ranjit Singh?

Which of the following statements is/are correct about the Land Revenue System of Ranjit Singh?

I. Batai System was replaced by a system of assessment known as Kankut.

II. The share of government was determined on the basis of a standing crop whose value was estimated in terms of money.

III. The state demand varied from two-fifths to one-third of the produce of the year.

IV. Land revenue was collected twice a year.

Which of the statements given above are correct?