Consider the statements about Alauddin Khilji:

1. Alauddin Khilji introduced market reforms and price controls to stabilize the economy.

2. He repelled Mongol invasions by Chengiz Khan multiple times.

3. Amir Khusrau, a famous poet wrote Khazain-ul-Futuh (The Treasures of Victory) about his administration.

4. His general Malik Kafur captured Warangal, Madurai, and Dwarasamudra in South India.

How many of the above statements are correct?