Final answer:
A D-ring on a safety harness should be connected to a lanyard which serves as a crucial safety measure for preventing or controlling falls.
Step-by-step explanation:
A safety harness typically includes a D-ring, a critical attachment point that connects the wearer to fall protection systems. To secure the D-ring, it's commonly attached to one end of a short section of webbing or wire rope known as a lanyard.
The lanyard acts as a flexible link between the D-ring of the safety harness and an anchorage point, such as a secure structure or lifeline. It provides the necessary length for movement while ensuring safety by connecting the worker to a secure point in the event of a fall.
The other options listed—carabiner, snap hook, and rope grab—are components often associated with fall protection systems. Carabiners and snap hooks are types of connectors used to link various components of safety equipment, while a rope grab is a device that grips a lifeline or rope during a fall, allowing for controlled descent or stopping. However, in the context of attaching to the D-ring of a safety harness, the lanyard serves as the connecting element between the harness and the anchorage point, ensuring worker safety at heights.