What is the requirement for any electric nail file used in a manicuring procedure?

For any electric nail file used in a manicuring procedure, it is essential that it is specifically designed for use on nails. This requirement ensures that the equipment is safe and effective for its intended purpose. Nail files designed for this specific use have appropriate speed settings, safety features, and shapes that cater to the unique structure of nails, minimizing the risk of damaging the nails or surrounding skin during use.

Other options do not meet the necessity for safety and suitability. While battery operation might be convenient for some instruments, it is not a requirement mandated by safety standards. A low power setting can be beneficial but is not a strict necessity for all electric nail files, as some may effectively operate at various power levels while still being designed for nails. The notion of being multi-purpose does not align with the focus on safety and proper use; tools intended for nail care should prioritize design and functionality specifically aligned with nail work. Thus, the correct answer emphasizes the critical aspect of design specificity to ensure safety and professionalism in manicuring practices.