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

Which of the following classes does 'Chicago Board Options Exchange' belong to as one valid explicit type? Context: Chicago Board Options Exchange operating-level market founded in 1973 that is the world's largest options market with contracts focusing on individual equities, indexes, and interest rates

A. regulated exchange
B. trade reporting facility
C. interdealer quotation system
D. operating-level market

Answer: operating-level market