Discussion
Data Integrity control uses _______
Answer: B
The official key gives 'Passwords to prohibit unauthorised access to files' as the answer. Controls such as passwords protect data from being altered or read by people who have no right to the files, which keeps the stored data trustworthy and so is treated here as a data integrity control.
Upper and lower limits on numeric data are validation rules, and the data dictionary options describe a catalogue of definitions and usage, not a control mechanism. The key is kept as printed.
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