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

The property 'is given by' applies to instances of 'Presentation', and 'Invited talk' is a subclass of 'Presentation'. Which class can appear as the value of 'is given by' for instances of 'Invited talk'?

A. Chair
B. Conference participant
C. Active conference participant
D. Submitted contribution

Answer: Active conference participant