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Which of the following would be considered restrictions of a hierarchical database structure?

Which of the following would be considered restrictions of a hierarchical database structure?

i.To be able to access a certain data entity within a hierarchical database requires the knowledge of which branch to start with and which route to take through each layer until the data are reached.
ii. To be able to access a certain key entity within a hierarchical database requires the knowledge of which branch to start with and which route to take through each layer until the data are reached.
iii. It does not use indexes as relational databases do for searching procedures.
iv. It does use indexes as relational databases do for searching procedures


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