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Ordinance No. 2025-04 of the Municipality of San Mateo prohibits the employment of foreign nationals in any private security agency operating within city limits, requiring agencies to hire only Filipino guards and to obtain a local clearance. The ordinance also imposes penalties for violations. The national government regulates employment and nationality through the Labor Code and related immigration laws, and there is no express preemption clause in the national statutes. (a) Identify the central doctrine governing local autonomy that applies. (b) Distinguish the controlling rule on preemption versus local regulation. (c) Apply to the facts: Is Ordinance No. 2025-04 valid? Why or why not?