What are the four roles the FAA plays in relation to airports?

The correct choice identifies the critical roles the FAA plays in ensuring the safety and efficiency of the national air transportation system.

The FAA is primarily a regulator, establishing and enforcing regulations to promote safety within aviation operations. As a grant giver, the FAA also provides essential funding to airports for infrastructure and development projects, allowing airports to maintain and improve their facilities. The permission-giver role highlights the FAA's authority in granting operational approvals, which is essential for ensuring that all aviation activities comply with safety standards. Lastly, as an air traffic control operator, the FAA manages air traffic flow, ensuring that aircraft movements are coordinated safely and efficiently.

These roles encompass a comprehensive framework that supports the vast network of air transportation, emphasizing the FAA's commitment to safety, operational integrity, and financial assistance in airport development and management.