What advice is recommended for a store owner dealing with product pests?

Rotating food stock is crucial for minimizing product pests because it ensures that older items are used or sold before they have a chance to become infested. This practice helps maintain freshness and reduces the likelihood of pests finding an established food source. By regularly moving older inventory to the front and placing newer stock behind it, the store owner can effectively limit the amount of time that any product is sitting on the shelves, which decreases the chance for pests to settle and reproduce.

This strategy not only helps keep pests at bay but also enhances overall inventory management, preventing losses due to spoilage or infestation. In contrast, the other options do not address the direct issue of preventing pest infestations related to the stock itself. For example, increasing security measures does not impact pest control directly, limiting customer access may not be feasible or effective, and changing suppliers frequently could lead to inconsistency in product quality without necessarily addressing pest problems effectively.