Task: Inferred Instance Class Reasoning (ontology: Business_Finance/Financial_Industry_Business_Ontology)

After reasoning over the ontology, which class is one valid inferred class for the instance 'TULLETT PREBON EUROPE - OTF - MADRID - CORPORATE BONDS AND SECURITISED DEBT'?

A. systematic internaliser
B. regulated exchange
C. operating-level market
D. alternative trading system

Answer: alternative trading system