Final answer:
Advertisements for frozen food uniquely emphasize the time saved by cooking pre-prepared meals, a significant advantage for consumers seeking convenience.
Step-by-step explanation:
The information that is found only in an advertisement for frozen food typically highlights the advantages, delivery time, variety, and time savings associated with the product. However, considering the context provided, the specific piece of information unique to such advertisements would likely be time saved by cooking frozen food. This aspect focuses on the convenience of preparing meals quickly due to their pre-cooked nature, a unique selling point for frozen foods. Advertisements may also discuss the variety of options available, a point that is often used to appeal to consumers looking for diverse and convenient meal choices.