When an emergency stop is necessary, which statement is true regarding the back-up person?

When an emergency stop is necessary, the back-up person's role is crucial for safety and coordination. They must give the stop hand signal to effectively communicate the need to halt operations, ensuring all team members are aware of the emergency. Additionally, by getting out of the way, they allow for a clear path for personnel and equipment to respond or escape from potentially dangerous situations without obstruction. This action also helps prevent confusion and ensures that the focus remains on the emergency at hand.

The other roles mentioned, while they may involve important tasks, do not capture the immediate and critical nature of the back-up person's responsibility during an emergency stop. Maintaining a clear signal and clearing the area ensures the safety of everyone involved in the operation.