System Analysis and Design
Advantages of Relational Database Management systems are

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.
All of these
Flexibility, of relating different logical files

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System Analysis and Design
An audit trial is

post-auditing the system after its implementation
None of these
All of these
test data used by the system auditor
designed to permit tracing of any input record or process performed on a system, back toits original sources

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