Final answer:
Heavy machinery must be properly anchored to ensure safety and prevent accidents when employees work under or between them. This is crucial when working with heavy machinery equipped with hydraulic and mechanical lever systems.
The correct answer is Option 1: Properly anchored.
Step-by-step explanation:
Heavy machinery, equipment, or parts which are suspended or held aloft by the use of slings, hoists, or jacks must be properly anchored to prevent falling or shifting before employees are permitted to work under or between them. This safety measure ensures the stability of suspended loads and the safety of workers during operations involving heavy machinery like backhoes, which employ hydraulic and mechanical lever systems for movement and lifting. When working with such equipment, it's crucial for the machinery to be secure to prevent accidents related to displacement or unintended movement.