Explanation:

- The Right to Education was incorporated as a fundamental right through the 86th Amendment to the Indian Constitution.

- Option: 3, 2002 is the year when this amendment was enacted, making education a fundamental right for children aged 6 to 14 years.

- Option: 1, 1997 is incorrect. In this year, there were no major changes affecting education rights.

- Option: 2, 1986 refers to the establishment of the National Policy on Education, aiming to improve educational quality in India, but not adding a fundamental right.

- Option: 4, 2004 is incorrect. It is not related to any major constitutional amendments about the right to education.