Final answer:
To prevent piggybacking, the technique that should be implemented first is to require all employees to wear security badges when entering the building.
Step-by-step explanation:
The technique that should be implemented first to prevent piggybacking is to require all employees to wear security badges when entering the building. Requiring employees to wear security badges provides a visible deterrent to unauthorized individuals attempting to enter the company premises. It also helps easily identify and track employees who are entering the building.
Installing CCTV to monitor the entrance and an RFID badge reader at the entrance are also effective measures to enhance physical security. However, requiring security badges is the most immediate and cost-effective solution to address the concern of piggybacking.
By implementing this technique, you will be able to control and verify the identity of individuals entering the company, minimizing the risk of unauthorized access and enhancing overall physical security.