What were the rules of the new education system for students?

The New Education Policy expands age group 6-14 years of mandatory schooling to 3-18 years of schooling. The NEP introduces hitherto uncovered three years of pre-schooling, age group of 3-6 years under the school curriculum. The new system will have 12 years of schooling with three years of Anganwadi/ pre-schooling.

Explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: