Answer: Opinion leader or influencer
Step-by-step explanation:
opinion leaders are those people who are mostly expert in a particular industry Information and their views or opinions are well known and commonly trusted. For this reason people usually count on their opinions and can use their influence in decision making process.
The Role of Opinion Leaders in Marketing
Opinion leaders have obtained an authority or power in a particular market in such that they are very good at impacting the audience on what is trending and hence impact the consumer or customers behavior. Some do this professionally and some have established the confidence within their community online or in their physcal vicinity.
Their opinions is used to validate the product just like Hank is doing for John validating his decision by giving him all the necessary information that he needs and making recommendations.