What is a common type of anchor used to fix inboard ends on a cantilevered scaffold?

The correct choice highlights the use of propping and cast-in inserts as a common type of anchor to secure the inboard ends of a cantilevered scaffold. Propping involves providing additional support from the ground or a structure, which helps to stabilize the scaffold and ensure that it remains safe and secure while in use. Cast-in inserts refer to metal components embedded in concrete that can be used to attach scaffolding components effectively.

This method is particularly advantageous because it provides a strong connection that can withstand lateral and vertical loads imposed during scaffolding operations. Using propping and inserts allows for greater flexibility in scaffold design and positioning while ensuring that the structure remains stable and complies with safety standards.

The other options do not typically serve the same anchoring purpose in the context of cantilevered scaffolding. Dynamic supports may be used in other contexts but are not specifically tied to anchoring cantilevered scaffold ends securely. Welded joints are more relevant for structural assemblies than for anchoring. Steel mesh is often used for containment or safety purposes but does not provide the anchoring function needed for scaffold stability.