What is a "core object" according to the domain-driven design principles of the SAP One Domain Model?

What is a "core object" according to the domain-driven design principles of the SAP One Domain Model?
A . An object that contains the essential attributes for the identity that are shared by writers and readers
B . An object containing identity attributes and application-specific additional data
C . An object that is consistent within a bounded context, enabling integration within a certain domain
D . An object that contains a superset of all attributes from different applications

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Answer: A