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

Which of the following classes does 'Refinitiv instrument code scheme' belong to as one valid explicit type? Context: proprietary identification scheme for securities identifiers managed by the London Stock Exchange Group's LSEG Financial Solutions

A. classification scheme
B. code set
C. proprietary security identification scheme
D. driver's license identification scheme

Answer: proprietary security identification scheme