System Analysis and Design
A couple:

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

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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
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
running the system with line data by the actual user

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