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

Which of the following classes does 'Euroclear Clearstream common code scheme' belong to as one valid explicit type? Context: nine-digit security identification scheme, defined originally by Euroclear and CEDEL (now Clearstream) that is used to identify securities in Europe for the purposes of facilitating clearing and settlement of trades

A. proprietary security identification scheme
B. code set
C. lifecycle
D. borrower identification scheme

Answer: proprietary security identification scheme