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

Which of the following classes does 'Bond Markets Unit European Unit of Account 17 (E.U.A.-17)' belong to as one valid explicit type? Context: the Bond Markets Unit European Unit of Account 17 (E.U.A.-17)

A. unit of account
B. index
C. nominal scale
D. physical unit

Answer: unit of account