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

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

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System Analysis and Design
Data manipulation language (DML)

all of the listed here
determine how data must be structured to produce the user's view
describes how data are structured in the data base
specifies for the DBMS what is required; the techniques used to process data

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