Task: Instance Class Understanding (ontology: Business_Finance/Financial_Industry_Business_Ontology)

Which of the following classes does 'XNYS-listed Citigroup Inc. common stock' belong to as one valid explicit type? Context: Citigroup Inc. common share listed in the New York Stock Exchange (NYSE)

A. National Information Center (NIC) registry entry
B. listing
C. ABA IIN registry entry
D. business registry entry

Answer: listing