Which of the following is a method to enhance facility resilience?

Investing in backup systems is a critical method to enhance facility resilience because it ensures that essential operations can continue during unforeseen disruptions, such as power outages, natural disasters, or equipment failures. Backup systems can include redundant power supplies, alternative communication channels, and fail-safe mechanisms that allow an organization to maintain functionality in the face of challenges. This proactive approach mitigates risk and promotes continuity, a key aspect of resilience.

The other options may contribute to operational effectiveness or security, but they do not directly address the core need for maintaining operations during disruptions. Routine inspections help identify maintenance needs; installing surveillance systems enhances security; and expanding workforce training improves skill sets. However, none of these measures provide the same level of assurance that backup systems do when it comes to sustaining critical functions during adverse events.