Identify the accurate legal and historical parameters defining the function of Article 31C within the Indian constitutional framework:
1. The article was specifically engineered to legally shield acts and regulations deposited into the Ninth Schedule from judicial review.
2. The article was introduced via the 25th Amendment in 1971 explicitly to nullify the restrictive legal barriers established by the Golaknath case.
3. The article establishes a legal shield ensuring that laws advancing the economic directives of Article 39(b) and (c) cannot be voided for breaching Articles 14 or 19.
4. The article explicitly dictates that the operation of the national economic system must not result in the dangerous concentration of elite wealth.