Security cameras are a form of deterrent control designed to discourage unauthorized individuals from attempting to access a secure area. Their presence is often enough to dissuade potential attackers as it increases the likelihood of being caught and recorded, which can lead to identification and potential prosecution. In contrast, badge readers and mantraps, while part of physical security measures, are types of preventive controls that actively prevent unauthorized access. Security awareness posters do not directly discourage trespassers from entering secured premises, as they are more focused on educating authorized personnel on maintaining security practices.