System Analysis and Design
Advantages of Relational Database Management systems are

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
None of these
Flexibility, of relating different logical files

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System Analysis and Design
Unit testing is

running the system with line data by the actual user
making sure that the new programs do in fact process certain transactions according to Specifications
None of these
testing changes made in an existing or a new program
is checking the logic of one or more programs in the candidate system

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System Analysis and Design
An audit trial is

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
None of these
All of these
post-auditing the system after its implementation

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