What is a key feature of a Jack Line in terms of heavy materials?

A Jack Line is a crucial component in theatre rigging, particularly when dealing with heavy materials. It functions as a safety line that supports the rigging process, ensuring that when heavy objects are being lifted or moved, there is an effective means of control and stability. This is especially important for managing heavy hemp line systems, which are often part of traditional rigging setups. By providing a secure connection and helping to distribute the load more effectively, Jack Lines enhance the safety and efficiency of rigging operations in a theatre environment.

While other options might touch on different aspects of rigging, they do not capture the specific role that a Jack Line plays in managing heavy materials. For instance, the notion of connecting multiple rigging systems or covering the stage floor does not pertain directly to the Jack Line's function. Its primary focus is on safety and load management during operations involving substantial weight, making it an essential feature in the rigging arsenal.