System Analysis and Design
Advantages of Relational Database Management systems are

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

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System Analysis and Design
Cost-Benefit analysis

compares the cost, with the benefits, of introducing a computer-based system
All of these
estimates the hardware and software costs
evaluates the tangible and non-tangible factors
None of these

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System Analysis and Design
Indexed-Sequential organization

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

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