Which of the following indicates that a product is not safe due to improper date marking?

A product that is unlabelled and has no date indication poses significant safety risks because consumers cannot determine its freshness or safety status. Proper date marking is essential in food safety as it helps to ensure that products are consumed within a safe timeframe and reduces the risk of foodborne illness.

Without a date, the consumer has no way of knowing when the product was produced or its expected shelf life, increasing the chance of consuming spoiled or unsafe food. This lack of information can potentially lead to health hazards, making it clear that proper labeling is a crucial aspect of food safety management.

In contrast, the other scenarios present specific conditions that might raise safety concerns but do not directly represent an absence of information. For example, a product marked as fresh but over two weeks old suggests it may no longer be fresh, while a frozen product kept at room temperature indicates improper storage rather than a lack of labeling. A product marked as safe for 30 days provides specific guidance, albeit potentially depending on the context of its storage and handling, and does not indicate a lack of safe status like the unlabelled product does.