What defines Interjurisdictional Immunity in Canadian law?

Interjurisdictional Immunity is a legal doctrine in Canadian constitutional law that aims to protect the core of a jurisdiction's competence from interference by another jurisdiction. It essentially asserts that certain fundamental areas of law or matters that fall within the exclusive authority of one level of government should not be encroached upon or adversely affected by the laws or actions of another level of government.

The correct choice indicates that a law can be contested based on its jurisdictional relevance, which aligns with the principles of interjurisdictional immunity. This means that if a law enacted by one level of government intrudes upon the core competencies of another level, it can be challenged on the grounds that it violates the jurisdictional boundaries established by the Constitution.

This principle serves to maintain the division of powers between federal and provincial governments, ensuring that each level of government can operate within its own areas of jurisdiction without undue interference from the other. Thus, the ability to contest a law based on its jurisdictional relevance is a central aspect of the interjurisdictional immunity doctrine, reinforcing the integrity and independence of each government's legislative authority.