Answer:
Sanitization.
Step-by-step explanation:
The sanitation of commercial frozen yogurt machines must be done frequently to maintain machine safety and sanitation. In this case, it's highly mandatory because yogurt is a very perishable product, which mean that can grow bacterias easily like all dairy products, they expired too fast.
Moreover, in business context, one of the challenges is to keep the machine clean, always bacteria free. The reason why is hard to keep clean is because yogurt is obtained through fermentation which is performed by bacteria. That's sanitization is needed, because through this process we can clean and remove bacterias.