System Analysis and Design
Unit testing is

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

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System Analysis and Design
A couple:

None of these
None of these
means that the upper module has the capability of calling the lower module
is a data item that moves from one module to another
is represented by a line joining two modules

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