Discussion
Hierarchical model is also called
Answer: A
Correct answer: Tree structure
The hierarchical model organises records into a tree: every record type except the root has exactly one parent, and access is by navigating down from the root. That single-parent rule is its limitation - a many-to-many relationship cannot be represented without duplicating data - and it is what the network model, a “plex” or graph structure, was devised to relax.
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