What markings are used to identify a blast pad, stopway, and EMAS?

Answer: B — Soylan markings

The correct identification of a blast pad, stopway, and EMAS (Engineered Material Arresting System) is represented by Soylan markings. These specialized markings are used to denote areas that are not intended for regular aircraft operations but provide safety measures for overruns and other emergencies. These markings are crucial for pilots and ground traffic to understand where the aircraft should not normally be while also delineating safety zones that aren't part of the runway or taxiway to facilitate safe operations during takeoff and landing. This helps to minimize confusion and enhances safety by clearly showcasing areas that may be critical in emergencies. In contrast, runway threshold markings are used to indicate where the runway begins, caution markings serve to alert pilots of various conditions, and Chelsea markings are not standard terminology within airport operations, which underscores why Soylan markings are the appropriate choice for identifying these specific safety features.