System Analysis and Design
Advantages of Relational Database Management systems are

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

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System Analysis and Design
Cost-Benefit analysis

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

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