System Analysis and Design
Unit testing is

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
None of these
making sure that the new programs do in fact process certain transactions according to Specifications

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System Analysis and Design
Sequential organization

has records placed randomly throughout the file
None of these
means storing records in contiguous blocks according to a key.
uses an index for each key type
Stores records sequentially but uses an index to locate records

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