Step 1: Understand the question.
We must say which level of education the Right to Education Act of 2009 covers.
Step 2: Recall the constitutional base.
The RTE Act came from Article 21A of the Constitution. This article makes free and compulsory education a fundamental right for a certain age group of children.
Step 3: Find the age group.
The RTE Act covers children from 6 to 14 years of age. We now match this age band to a level of schooling.
Step 4: Match age to level.
The 6 to 14 age group covers Classes 1 to 8. This block of classes is called elementary education, not just primary, and not secondary or higher.
Step 5: Check the options.
Primary alone is only the first part. Senior secondary and higher education come much later. Only elementary education covers the full 6 to 14 band.
Step 6: Match with the options.
The second option, Elementary education, is correct.
\[ \boxed{\text{Elementary education}} \]