Which of these regulations is established at the federal level?

Federal regulations are specific details directives or requirements with the force of law enacted by the federal agencies necessary to enforce the legislative acts passed by Congress. The Clean Air Act, the Food and Drug Act, the Civil Rights Act are all examples of landmark legislation requiring months, even years of highly publicized planning, debate, compromise and reconciliation in Congress. Yet the work of creating the vast and ever-growing volumes of federal regulations, the real laws behind the acts, happens largely unnoticed in the offices of the government agencies rather than the halls of Congress.