Task: Property Constraint Reasoning (ontology: Earth_Environment/OBOE)

The property 'has qualifier' applies to instances of 'Measured Characteristic', and 'Conductivity' is a subclass of 'Measured Characteristic'. Which class can appear as the value of 'has qualifier' for instances of 'Conductivity'?

A. Characteristic Qualifier
B. Measurement Type
C. Observation
D. Characteristic

Answer: Characteristic Qualifier