Final answer:
The potential hazards associated with metallic objects near machinery include electrical shock, crushing injuries, and the projectile effect, indicating that all the options (A, B, and C) are correct.
Step-by-step explanation:
Among the potential hazards associated with metallic objects within the vicinity of a machine, the correct answer is D. All of the above. Metallic objects can conduct electricity and may cause an electrical shock if they come into contact with live electrical components. This presents a clear shock hazard where electric current may pass through a person. Additionally, metallic objects in a machine environment can lead to crushing injuries if the objects are heavy and fall onto someone, or if they are caught in moving parts of machinery. Finally, the projectile effect is a concern when metallic objects are thrown or propelled from the machine, either due to machine malfunction, accidental contact, or other physical interactions, which can cause injuries or damage to other equipment or personnel in the vicinity. Therefore, electrical, mechanical, and kinetic hazards all stem from the presence of metallic objects near machinery.