Food workers must be trained in:

Food workers must be trained in all safety protocols, which include food handling and hygiene. Proper training in food handling and hygiene is crucial because it ensures that food is prepared, stored, and served in a way that minimizes the risk of contamination and foodborne illness. This encompasses understanding how to maintain cleanliness, proper cooking temperatures, cross-contamination prevention, and personal hygiene practices.

In addition to food handling and hygiene, training on all safety protocols means that workers are also aware of various other safety procedures that could encompass aspects such as equipment safety, emergency procedures, and compliance with health regulations. These comprehensive protocols help create a safer operating environment for both workers and customers.

While customer service skills are important in the hospitality industry, they do not fulfill the primary requirement for food safety education. Therefore, the combination of all safety protocols, along with food handling and hygiene training, is essential to ensuring the safety and well-being of the public. This makes the choice of being trained in all safety protocols and food handling and hygiene the most comprehensive and appropriate answer.