Which of the following methods is used by retailers to secure products from theft?

Closed-circuit cameras are an effective method used by retailers to secure products from theft. These surveillance systems allow retailers to monitor their premises in real-time and review footage to identify any suspicious behavior or actions. The presence of cameras can act as a deterrent to potential thieves, as they are aware that their actions are being recorded, which increases the likelihood of being caught. Additionally, the recorded footage can provide valuable evidence if a theft does occur, enabling retailers to take appropriate action.

In contrast, while price marking and inventory auditing play important roles in inventory management—helping track product sales and availability—they are not primarily focused on theft prevention. Employee training can also help deter theft by making staff more vigilant and aware of security measures; however, it does not provide constant monitoring like closed-circuit cameras do. Thus, the use of surveillance technology is a direct approach to prevent theft and enhance security in retail environments.