Concept:The Right to Education (RTE) Act was passed in 2009 but came into effect on 1st April, 2010, ensuring free and compulsory education for children aged 6-14.Explanation:The RTE Act was passed by the Indian Parliament on 26th August 2009. However, it was implemented nationwide from 1st April, 2010. This law makes education a fundamental right under Article 21A of the Constitution. It mandates free and compulsory education for all children between 6 and 14 years. Key provisions include appointing trained teachers, improving school infrastructure every three years, prohibiting private tuition by teachers, and reserving 25% seats in private schools for economically weaker sections. Teachers cannot be assigned non-academic work except for census, elections, and disaster relief. Primary schools must be within 1 km and upper primary schools within 3 km of a child's home.Answer:A. 1st April, 2010