Which of the following contributes to maintaining inventory levels in the deli?

Maintaining inventory levels in the deli is crucial for ensuring that product demands are met without excess waste or shortages. Sales trends and expiration dates play a significant role in this process. By analyzing sales trends, the deli can understand which products are most popular and adjust their inventory orders accordingly. For example, if a particular sandwich is selling well, the deli would increase inventory to avoid running out.

Additionally, tracking expiration dates helps prevent food waste and ensures that the products offered are fresh. Proper management of both sales trends and expiration dates enables the deli to replenish stock efficiently and maintain an optimal inventory level. This, in turn, enhances customer satisfaction and reduces potential losses from unsold, expired products.

The other options, while important in their contexts, do not directly address inventory management as effectively as sales trends and expiration dates do. Calculating employee hours is related to labor management, customer feedback pertains to service quality and product improvement, and marketing strategies focus on promotions and outreach rather than inventory control directly.