Which of the following is a sign of a possible pest issue?

Gnaw marks on packaging indicate that pests, such as rodents, have been accessing food products. These marks suggest a potential pest problem in the area, as they usually occur when pests are looking for food. Addressing this issue quickly is crucial to maintain food safety and prevent contamination.

In contrast, uncluttered storage areas, brightly lit kitchens, and clean floors are generally indicators of effective cleanliness and organization within a food establishment. These conditions are typically associated with good sanitation practices and do not signal pest problems. Keeping storage areas organized and clean, along with ensuring adequate lighting, helps in monitoring for any signs of pests, but the presence of gnaw marks is a direct indication of an existing issue that needs to be addressed.