What are the markings for taxiway and apron edges?

The correct choice outlines the standard visual markings used to denote taxiway and apron edges. The two continuous 6-inch wide stripes, separated by a 6-inch wide gap, provide clear, unambiguous guidance to pilots and ground vehicles. This design ensures that there is a clear distinction between the taxiway or apron surface and the areas adjacent to them, which helps maintain safe operations on the airfield.

These markings are essential for navigation and help prevent accidents by clearly defining where the taxiway ends and where other surfaces, such as runways or non-movement areas, begin. The dimensions specified (6-inch wide stripes and gap) are standardized in aviation regulations to ensure consistency across airports, enhancing safety and operational efficiency.

Other options do not adhere to the regulatory standards for marking taxiway and apron edges. The alternative markings mentioned might represent other features in aviation, but they do not provide the specific and easily recognizable guidance required for taxiway and apron delineation.