Final answer:
The deli worker must first wash her hands before using the restroom and inform a colleague.
Step-by-step explanation:
The deli worker must first wash her hands before using the restroom. This is an important step to maintain hygiene and prevent the spread of germs.
After washing her hands, she should inform a colleague that she is stepping away temporarily. This keeps her colleague aware of the situation and helps maintain smooth workflow in the deli.