Answer: D. The advertiser must prove he was grandfathered in as a licensee.
Explanation:
The person has engaged in a false statement and is also an unlicensed person. The question states which of the following is not true. Which means that the advertiser must prove he was grandfathered in as a license is untrue. All the other option is true. Grandfathered in means that the individual is still functioning in an old rule rather than the new one.