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

The property 'has monitoring period' applies to instances of 'barrier option', and 'digital option' is a subclass of 'barrier option'. Which class can appear as the value of 'has monitoring period' for instances of 'digital option'?

A. date period
B. Asian option classifier
C. averaging strategy
D. cliquet option

Answer: date period