System Analysis and Design
Back-up procedure helps in

restoring the operation whenever there is a disk failure
restoring the data files whenever there is a system crash
all of the listed here
none of the listed here

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System Analysis and Design
Rapid prototyping proves the quality of a design by

having the system analyst present an overview of the design to users, programmers, and consultants
None of these
both (a) and (b)
having a program simulate the real system
having a data flow diagram

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