Which procedure is used as a physical barrier to secure data against unauthorized access in a cloud storage data center?
hiring only employees with no police record
keeping the firewall up to date
keeping antivirus software up to date
restrict user access to the server center by using keycards

D. Restrict user access to the server center by using keycards

Explanation:

A keycard is a modern smart plastic card with an application programming interface. It stores a digital signature on an embedded magnetized strip that is used to operate an electronic access control lock instead of using a key to open a door.

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explanation: