According to IIA guidance on IT, which of the following strategies would provide the most effective access control over an automated point-of-sale system?

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According to IIA guidance on IT, which of the following strategies would provide the most effective access control over an automated point-of-sale system?
A . Install and update anti-virus software.
B . Implement data encryption techniques.
C . Set data availability by user need.
D . Upgrade firewall configuration

Answer: C