Concept:The diagram shows a database model where records are linked through multiple relationships.
Explanation:In the figure, each lower record can be connected to more than one upper record.
This many-to-many connection means it is not a simple hierarchical tree.
A hierarchical database allows each record to have only one parent, like a tree.
Here, records are linked to several owners, so it matches the network database model.
A flat file database is only a single table.
A parallel database is used with multiple processors, not with record links.
Therefore, the diagram is best described as a network database.
Answer:C. network database
