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

The property 'has yield' applies to instances of 'tradable debt instrument', and 'variable income security' is a subclass of 'tradable debt instrument'. Which class can appear as the value of 'has yield' for instances of 'variable income security'?

A. effective duration
B. debt instrument yield
C. key rate duration
D. MacCaulays Duration Analytic

Answer: debt instrument yield