With reference to the Mughal administration, consider the following statements:

1. The Jagirdars were allowed to collect only authorized revenue in accordance with the imperial regulations.

2. Faujdar used to help the Jagirdas if they faced any difficulty in the collection of revenue.

3. The jagirdars could not employ their own officials.

4. The Diwan of the Suba was supposed to prevent the oppression of the peasants by the Jagirdars.

How many of the statements given above are correct?