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The germicidal solution is the most appropriate choice for sanitizing the ultrasonic unit because it is formulated specifically to eliminate a wide range of microorganisms, including bacteria and viruses. Ultrasonic cleaners are typically used in tattoo parlors to thoroughly clean and sanitize tattoo instruments. A germicidal solution contains specific properties that not only clean but also disinfect, ensuring that any potential pathogens are effectively destroyed before the instruments are reused.

Other solutions, such as alcohol, may not be as effective for thorough sanitation as they primarily focus on surface cleaning rather than providing deep sterilization. Sodium chloride solution is usually not intended for disinfecting equipment in this context, as it lacks the necessary germicidal properties. Hydrogen peroxide can be an effective cleaner but is not typically recommended for cleaning and disinfecting ultrasonic units due to possible reactions with certain materials and less effectiveness against some pathogens.