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

The property 'calculation following' applies to instances of 'debt instrument yield', and 'debt yield to average life' is a subclass of 'debt instrument yield'. Which class can appear as the value of 'calculation following' for instances of 'debt yield to average life'?

A. debt convexity analytic
B. yield calculation formula
C. yield calculation method
D. weighted average time to receipt of cashflows

Answer: yield calculation method