Which of the following statements are correct?

1. Vallabhai Patel organized Bardoli Satyagraha against the increase over the existing land revenue.

2. Rajinder Prasad organized Dharsana Salt Works Raid during the Civil Disobedience Movement.

3. Nagpur Flag Satyagraha was organized against the prohibition on use of congress flag in certain areas of the city of Nagpur.

4. Vaikom Satyagraha was organized over the issue of temple entry.

Select the correct answer from codes given below