In a Common-Law Country, Ownership of Intellectual Property Rights Is

In a common-law country, ownership of intellectual property rights is established by "prior use versus registration" which implies that to claim the ownership of a trademark, an individual:

A) must be ratified by the United Nations trademark protection agency.
B) must pay for the right to own a trademark.
C) must establish first use of a trademark.
D) must prove the ownership of a trademark in a court of law.
E) must register a trademark only in his home country.