With reference to Article 15 of the Indian Constitution, consider the following statements:

1. Article 15(1) prohibits discrimination by the state on grounds of religion, race, caste, sex, or place of birth.

2. Article 15(3) empowers the state to make special provisions for women and children.

3. Article 15(4) allows the state to make special provisions for the advancement of socially and educationally backward classes.

How many of the statements given above are correct?