Who is considered a domestic representative in trademark matters?

In trademark matters, a domestic representative is primarily someone who can represent a party before the United States Patent and Trademark Office (USPTO) without being required to be an attorney. This option highlights that there are provisions allowing individuals, such as a principal of a business or other designated representatives, to handle certain matters before the USPTO. This role is especially important for non-U.S. applicants, as they need a domestic representative to facilitate correspondence and filings in the U.S. trademark process.

The other choices detail valuable roles but do not capture the specific requirement of a domestic representative. An attorney representing the party is crucial for legal guidance and representation but is not strictly necessary to qualify as a domestic representative. Designated agents for legal matters are more broad and may not have the specific authority or requirements of a domestic representative. Meanwhile, an expert advisor on trademark compliance can provide insights and assistance but does not fulfill the requirement of representation before the USPTO. Thus, the distinctive quality of a domestic representative being someone who can act without being an attorney makes the correct answer particularly relevant for understanding trademark representation requirements.