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

The property 'has structure name' applies to instances of 'physical address', and 'post office box address' is a subclass of 'physical address'. Which class can appear as the value of 'has structure name' for instances of 'post office box address'?

A. structure name
B. secondary unit
C. primary address number
D. geographic directional symbol

Answer: structure name