Which type of crane is not permitted for hoisting personnel?

The correct answer is that live booms are not permitted for hoisting personnel. Live booms, also known as flexible booms, are typically designed for lifting and transporting materials, rather than for safely carrying personnel. The design involves mechanisms that allow the boom to move in a more dynamic manner, which can create instability and may not provide the necessary safety features for personnel lifting.

In contrast, fixed booms, articulated booms, and adjustable booms are designed with better stability and control, making them more appropriate for hoisting personnel when equipped with the correct safety features, such as a personnel basket, and when operated by trained personnel following appropriate safety protocols. Each of these alternatives offers a level of rigidity or control that aligns more closely with safety standards required for personnel lifting applications.