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

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

A. time unit
B. software
C. substance unit
D. background correction

Answer: software