A fall arrest attachment with a web loop must be attached to a harness with what?

The correct answer is based on the requirement that a fall arrest attachment, which often involves working at heights, must secure properly to ensure safety. In this case, a web loop needs to be connected to a harness in a way that is both secure and reliable. The use of a hitch or a carabiner is a common practice in fall arrest systems.

A hitch ensures that the attachment is tightened properly, preventing any slippage, while a carabiner serves as a strong and reliable connector that can easily attach and detach when necessary. The combination of a hitch and a carabiner ensures that the system is not only quick to use but also meets safety standards, providing a firm anchor point for the harness.

Other options mention different types of connectors, such as locking snap hooks and metal connectors, which may not provide the same level of security or compatibility with web loops as the chosen answer. It's important that any connector used in safety equipment is appropriate for the specific type of loop and harness being utilized, ensuring compliance with safety guidelines and manufacturer specifications.