Which of the following must be included in advertising materials according to New Jersey state law?

In New Jersey, advertising materials must include full and truthful disclosures to ensure transparency and honesty in marketing practices. This requirement is crucial because it helps protect consumers from misleading or deceptive advertising. By requiring that all claims made within advertisements are accurate and adequately substantiated, the law aims to foster trust and accountability between businesses and consumers.

Including full and truthful disclosures means that any limitations, conditions, or other relevant facts that could affect a consumer's decision must be clearly communicated. This principle is fundamental in maintaining ethical advertising practices and aligning with consumer protection laws. It allows consumers to make informed choices based on complete and accurate information.

The other options, while potentially useful in certain marketing strategies, do not have the same legal stipulations tied to them. Personal testimonials, expert endorsements, and price comparisons can be employed as marketing tools but are not mandated by law to be included in advertising materials as a requirement.