Task: Instance Description Understanding (ontology: Business_Finance/Financial_Industry_Business_Ontology)

Which of the following definitions best describes the instance 'thirty years'?

A. duration of exactly the instance, or 7 days
B. duration of exactly the instance, or 24 hours, such as for an overnight rate
C. duration of exactly the instance, regardless of the length in days of a given calendar month, but typically 30 days
D. duration of exactly the instance

Answer: duration of exactly the instance