Where is the Flight Restriction Zone (FRZ) located?

The Flight Restriction Zone (FRZ) is specifically designed to enhance security measures surrounding sensitive areas, particularly in and around Washington DC. This area has been established to prevent unauthorized aircraft from entering a space that is critical to national security. The FRZ includes various airspace restrictions and is closely monitored to ensure the safety of operations in this region.

In contrast, the other options relate to different types of airspace or operational concerns: international airports and Class C airports have their own specific regulations and restrictions, but they do not relate to the special security context that defines the FRZ. Similarly, while military zones also have airspace that can be restricted, they are not categorized as Flight Restriction Zones in the same way that the area surrounding Washington DC is specifically defined and enforced for security reasons.