Task: Property Constraint Reasoning (ontology: Sciences/Computer_Science)

The property 'is implemented by' applies to instances of 'algorithm', and 'Gamma Gamma Model' is a subclass of 'algorithm'. Which class can appear as the value of 'is implemented by' for instances of 'Gamma Gamma Model'?

A. software
B. NIDA NIH Data Access Policy
C. Textual format
D. pathologic primary tumor stage for kidney according to AJCC 7th edition

Answer: software