Answer:
Third party endorsement
Explanation:
Third Party Endorsement refers to the recommendation from an entity or individual who is neither the manufacturer of the product nor the seller of it (thus, the "third party").
Usually, a Third Party Endorsement is used to persuade consumers to buy the endorsed product since the consumer trusts the endorser.
In this case, Kellogg's product has a seal of the American Heart Association, it is clear that <u>this Association is neither the manufacturer nor the seller of Kellogg's product.</u>
On the other hand, this Association has a reputation of trustworthiness and expertise, <u>this reputation gives consumers the confidence that the product is indeed a healthy choice (as the seal says)</u>.
Since the seal is from a third party and it helps to persuade consumers to buy the product, this is an example of "third party endorsement".