What is the order in which the caste system has changed in India? (put it in correct order)
1. Castes are rigid and inflexible; people are born into a caste and cannot leave it.

2. Discrimination based on caste is determined to be illegal.

3. A system of social classes based on birth evolved.

4. Castes are a prominent part of people's lives, but people may have been able to move around.