System Analysis and Design
An audit trial is

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

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System Analysis and Design
Unit testing is

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

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