System Analysis and Design
System prototyping helps the designer in

giving a demo of the software, to the system manager to whom he reports
communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
making the programmers understand how the system will function.
all of the listed here

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System Analysis and Design
Unit testing is

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

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