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

The property 'has contractual element' applies to instances of 'agreement', and 'mutual agreement' is a subclass of 'agreement'. Which class can appear as the value of 'has contractual element' for instances of 'mutual agreement'?

A. breach of contract
B. identity document
C. contractual definition
D. contractual element

Answer: contractual element