What property must be set in the foreign key for the relationship to be from the owner entity to the new entity?

The correct choice is the property that indicates which entity has ownership in a relationship between two entities. When establishing a relationship in Guidewire, setting the archivingOwner property within the foreign key is essential for defining the direction of ownership. Specifically, this property indicates that the new entity is a child entity of the owner entity, thereby solidifying the hierarchical relationship between the two.

In this context, the archivingOwner property is used to signify the entity that holds the primary responsibility or control over the data associated with the child entity. By setting this property correctly, developers ensure that the data model reflects the logical relationship intended between the two entities.

The other options serve different purposes. archivingKey generally relates to identifying unique records for archiving, sourceEntity pertains to the origin of data rather than ownership, and ownerEntity could refer to the entity defining resources but does not directly establish the owner-child relationship as effectively as archivingOwner. Thus, understanding the purpose of each property helps in applying correct data modeling practices within Guidewire.