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

The property 'has wac' applies to instances of 'mortgage-backed security', and 'tranched m b s instrument' is a subclass of 'mortgage-backed security'. Which class can appear as the value of 'has wac' for instances of 'tranched m b s instrument'?

A. pool factor
B. weighted average coupon
C. equivalent yield calculation method
D. life analytic

Answer: weighted average coupon