System Analysis and Design
Unit testing is

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

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

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