Which of the following is correct regarding the Clean Air Act (CAA)?

A. Air quality standards are set federally, but the states are required to establish implementation plans to achieve and maintain those standards.

B. Private companies receiving federal contracts, funding, and licenses must file an environmental impact statement (EIS).

C. Limits are imposed on the amount of pollutants that may lawfully enter the air of the United States from any "point source."

D. All pollutant dischargers are required to secure an Environmental Protection Agency (EPA) permit before releasing ozone-destroying particles