System Analysis and Design
Advantages of Relational Database Management systems are

None of these
Flexibility, of relating different logical files
Security controls can be more easily implemented.
Data independence since it allows the database to grow by adding new attributes and relations.
All of these

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System Analysis and Design
Indexed-Sequential organization

stores records sequentially but uses an index to locate records
has records placed randomly throughout the file
means storing records in contiguous blocks according to a key
uses an index for each key type

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