What must be used for an aircraft in relation to taxiway edge markings?

For aircraft in relation to taxiway edge markings, the correct choice is the use of double yellow lines that indicate a load-bearing surface. This marking is critical as it provides clear guidance to pilots and ground vehicle operators regarding the boundaries of the taxiway and where the surface can safely support the weight of aircraft.

Double yellow lines visually delineate areas where aircraft should not proceed beyond, and understanding these markings is essential for ensuring the safety of operations on the airfield. Familiarity with these markings allows operators to make safe and informed decisions while navigating taxiways, thus preventing potential incidents and ensuring the smooth operation of the airfield.

While the other options describe various markers that might exist in an airport environment, they do not accurately represent the standard practice for taxiway edge markings related to aircraft. The context and importance of the double yellow lines emphasize their role in maintaining safety and operational efficiency on airside surfaces.