Which of the following is a common security measure implemented by hotels?

Implementing key card access systems and CCTV surveillance is a critical security measure commonly adopted by hotels to ensure the safety and security of guests, staff, and property. Key card access systems restrict entry to guest rooms and other secure areas, allowing only authorized individuals to enter specific locations within the hotel. This minimizes the risk of unauthorized access and enhances guest safety.

CCTV surveillance adds an additional layer of security by monitoring public areas and entrances, helping deter potential criminal activities and providing valuable evidence in case of incidents. Together, these measures create a safer environment for both guests and employees, which is a top priority for hotels in maintaining their reputation and ensuring guest satisfaction.

Other options, while related to hotel operations, do not primarily serve the purpose of enhancing security. Digital booking systems facilitate reservations and streamline operations, online guest feedback reviews are essential for quality assessment and service improvement, and promotional discount offers focus on marketing strategies rather than security measures. Therefore, the combination of key card access systems and CCTV surveillance stands out as the most relevant and effective method for ensuring security in a hotel setting.