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

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

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System Analysis and Design
The black-box concept:

is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
All of these
assumes that inputs and outputs will remain stable
None of these
assumes that the black box is independent

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System Analysis and Design
The Turnaround is

None of these
the elapsed time between the receipt of the input and the availability of the output
the key information of programming
a program statement that violates one or more rules of the language in which it is written
a group of related fields

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