Final answer:
When a trigger term is used in an advertisement, additional information that is relevant to the trigger term must be disclosed. This ensures that consumers have all the necessary information to make an informed decision.
Step-by-step explanation:
When a trigger term is used in an advertisement, it is necessary to disclose additional information that is relevant to the trigger term. The purpose of this disclosure is to ensure that consumers have all the necessary information to make an informed decision about the product or service being advertised. For example, if an advertisement uses a trigger term like 'free' to describe a product, the advertiser must disclose any conditions or requirements that need to be met in order to obtain the free offer.