Which of the following statements about the 'Mughal Jagir' system is/are correct?

1. The Jagirdari system was a vital aspect of the mansabdari system that emerged under Babur.

2. Jagirdars were frequently transferred as promotion and demotion were a regular part of the empire.

3. Jagirdars were responsible for maintaining the law and order and collection of land revenue.

Select the correct answer using the code given below.