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

Which of the following classes does 'Citibank, N.A. RTN' belong to as one valid explicit type? Context: routing transit number (RTN) for Citibank, N.A.

A. birth certificate identifier
B. license identifier
C. registration authority code
D. routing transit number

Answer: routing transit number