Task: Property Constraint Reasoning (ontology: Business_Finance/Financial_Industry_Business_Ontology)

The property 'has exercise style' applies to instances of 'option', and 'vanilla option' is a subclass of 'option'. Which class can appear as the value of 'has exercise style' for instances of 'vanilla option'?

A. option trading strategy
B. intrinsic value
C. collar
D. exercise convention

Answer: exercise convention