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

Which of the following classes does 'Citi Cards South Dakota Acceptance Corp. RSSD identifier' belong to as one valid explicit type? Context: research statistics supervision discount identifier (RSSD ID), assigned by the Federal Reserve to Citi Cards South Dakota Acceptance Corp.

A. Research, Statistics, Supervision and Regulation, and Discount and Credit identifier
B. physical address identifier
C. unit of account identifier
D. currency identifier

Answer: Research, Statistics, Supervision and Regulation, and Discount and Credit identifier