An auditor is evaluating a control related to a key card mechanism protecting a data center from unauthorized visitors. The auditor has determined that the key card control is ineffective because visitors often “piggyback” their way into the data center. What detective control should be implemented to compensate for this control deficiency?

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An auditor is evaluating a control related to a key card mechanism protecting a data center from unauthorized visitors. The auditor has determined that the key card control is ineffective because visitors often “piggyback” their way into the data center. What detective control should be implemented to compensate for this control deficiency?