Final answer:
The 'Official Plan' of a Canadian municipality is approved by the local municipal council, which is typically led by the mayor. In some cases, additional approval from regional or provincial authorities may be required.
Step-by-step explanation:
The approval of an 'Official Plan', particularly in a Canadian context, is typically the responsibility of municipal or local government. The municipal council, which is led by the mayor, debates and ultimately approves The Official Plan after considering input from various stakeholders and the community at large. However, in some cases, after a municipal council approves the plan, it may also require further approval by a regional or provincial authority, depending on the jurisdiction and the scope of the plan in question. That being said, the United States-Canada Regulatory Cooperation Council (RCC) Joint Action Plan mentioned in the supporting document relates to bilateral regulatory cooperation rather than the approval of municipal official plans. This Joint Action Plan focuses on developing and implementing strategies for regulatory cooperation between the United States and Canada, led by federal entities in both countries.