What action is best described as reinforcing security measures to prevent breaches?

The action described as reinforcing security measures to prevent breaches is best captured by hardening the building. Hardening involves enhancing the physical security of a structure through various methods, such as improving locks, reinforcing doors and windows, and adding barriers to deter unauthorized access. This multifaceted approach creates a more challenging environment for potential intruders, effectively bolstering the overall security of the premises.

While other options like securing the perimeter, increasing surveillance, and implementing access control are also vital components of a comprehensive security strategy, they focus on different aspects. Securing the perimeter addresses the outer boundary of a facility, while increasing surveillance enhances monitoring capabilities, and implementing access control regulates who can enter specific areas. Hardening the building, however, directly affects the physical integrity of the structure itself, thereby preventing breaches more effectively.