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

The property 'has first premium call date' applies to instances of 'call feature', and 'partial call feature' is a subclass of 'call feature'. Which class can appear as the value of 'has first premium call date' for instances of 'partial call feature'?

A. explicit date
B. partial redemption allocation convention
C. last regular coupon date
D. variable interest expression

Answer: explicit date