System Analysis and Design
Backup and recovery procedures are primarily implemented to

handle the contingency when a file gets corrupted
None of these
to provide data redundancy
All of these
to show different versions of data and programs

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System Analysis and Design
System prototyping helps the designer in

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

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