What type of hook is required when lifting personnel with a crane?

When lifting personnel with a crane, it is crucial to use a hook that can be closed and locked. This type of hook ensures that there is no possibility of the lifted load, in this case, personnel, accidentally disengaging during the lift. A securely locked hook provides an extra layer of safety, preventing any potential falls or accidents that may occur if the load were to slip off.

Using a hook that can be closed and locked is essential in compliance with safety regulations when personnel are being lifted. It is a necessary requirement in many safety protocols as it mitigates risks associated with lifting operations involving human lives. Therefore, the design and mechanism of the hook play a significant role in ensuring a safe working environment on construction or maintenance sites.

The focus on safety and reducing accident risks is why this option stands out as the correct choice when dealing with personnel lifts. Other types of hooks may not offer the same level of security needed for such critical operations.