The correct answer is It was a part of the original constitution.
The Ninth Schedule contains a list of central and state laws that cannot be challenged in courts.
Currently, 284 such laws are shielded from judicial review.
The Schedule became a part of the Constitution in 1951 when the document was amended for the first time.
It was created by the new Article 31B, which along with 31A was brought in by the government to protect laws related to agrarian reform and for abolishing the Zamindari system.
While Article 31A extends protection to ‘classes’ of laws, Article 31B shields specific laws or enactments.