Final answer:
Barber-stylists should wear protective gloves when applying the processor to ensure their safety and prevent any skin irritations or infections.
Step-by-step explanation:
When applying the processor, a barber-stylist must wear D. protective gloves. Protective gloves are necessary to prevent any potential skin irritations or infections that may arise from exposure to chemicals or heat during the hair treatment process. These gloves offer a barrier between the barber-stylist's hands and the products being used, ensuring both their safety and the safety of their clients.
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