Personnel working aloft must wear safety harnesses equipped with which type of assemblies?

The correct answer highlights the importance of safety when personnel are working aloft. Dynabrake assemblies are designed to provide a controlled descent in the event of a fall, as they have features that can slow down or arrest a person's fall effectively. This safety mechanism is essential in environments where the risk of falling from heights is present.

In contrast, other assemblies may not offer the same level of fall protection or descent control capability. Quick-release assemblies, while useful in certain scenarios, may not provide the necessary safety measures required for working at dangerous elevations. Safety clips and standard hooks serve specific purposes in securing harnesses but do not include the advanced fall arrest capabilities of the Dynabrake, which is specifically engineered for high-risk activities involving heights. This makes Dynabraake assemblies the preferred choice for ensuring the security and safety of personnel working aloft.