System Analysis and Design
Back-up procedure helps in

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

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System Analysis and Design
The rule(s) to follow in constructing decision tables is (are):

a decision should be given a name
the logic of the table is independent of the sequence in which conditions rules are written, but the action takes place in the order is which the events occur.
all of the listed here
standardized language must be used consistently.

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