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

The property 'has 2D boundary' applies to instances of 'material entity', and 'fiat object part' is a subclass of 'material entity'. Which class can appear as the value of 'has 2D boundary' for instances of 'fiat object part'?

A. spatiotemporal region
B. credential granting agency
C. specifically dependent continuant
D. immaterial entity

Answer: immaterial entity