Final answer:
The safe use of compressed air for cleaning requires that a person has been trained in safe compressed air usage. Appropriate personal protective equipment should be worn, and the area must be well ventilated.
Step-by-step explanation:
When it comes to the use of compressed air for cleaning, there are specific circumstances under which it is considered appropriate and safe.
The correct answer to the question is B) You have been trained in safe compressed air usage. It is essential to have the appropriate training to understand how to handle compressed air safely and to be aware of the potential hazards. This includes being knowledgeable about safe operating pressures and how to use the equipment correctly to avoid accidents.
Another crucial aspect of safe usage is wearing the appropriate personal protective equipment (PPE), such as gloves and goggles, to protect yourself from flying debris and to prevent injury to the eyes or skin. Moreover, it's important to always work in a well ventilated area when dealing with compressed air to avoid the buildup of harmful vapors or dust in the air that can be hazardous when inhaled.
In contrast, options A, C, and D from the question do not offer the primary justification for when to use compressed air.