System Analysis and Design
In Data structure, main characteristic of "ring" is :

many records point to one record
All of these
None of these
first record points only to the last record
last, record points to the first record

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System Analysis and Design
Unit testing is

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

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