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

The property 'has contract duration' applies to instances of 'contract', and 'unilateral contract' is a subclass of 'contract'. Which class can appear as the value of 'has contract duration' for instances of 'unilateral contract'?

A. duration
B. milestone schedule
C. condition precedent
D. term sheet

Answer: duration