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

Which of the following classes does 'Bond Markets Unit European Unit of Account 9 (E.U.A.-9)' belong to as one valid explicit type? Context: the Bond Markets Unit European Unit of Account 9 (E.U.A.-9)

A. unit of account
B. ordinal scale
C. funds
D. measurement procedure

Answer: unit of account