Final answer:
Disinfectants used in salons, spas, and barbershops must have bactericidal, fungicidal, and virucidal properties, but they are not required to be hypoallergenic.
Step-by-step explanation:
The requirement for disinfectants used in salons, spas, and barbershops is that they must be able to kill microorganisms effectively. Bactericidal, fungicidal, and virucidal properties are necessary as these disinfectants are meant to inactivate most microbes on the surface of nonliving objects, known as fomites. Disinfectants are essential for maintaining hygiene and preventing the spread of infections. However, they do not need to be hypoallergenic, as their primary function is to inactivate pathogens rather than be gentle on human skin or tissues. So, the correct answer to the question is: They must be hypoallergenic.