Which technique is effective for enhancing physical security?

Installing surveillance cameras in sensitive areas is an effective technique for enhancing physical security because it serves multiple critical purposes. Surveillance cameras act as a deterrent to unauthorized access or criminal activity, as their presence can discourage potential intruders from attempting to breach security. Additionally, these cameras provide a means of documenting events as they happen, which can be invaluable for investigating security incidents or analyzing behaviors in sensitive areas.

Moreover, camera footage can assist security personnel in monitoring real-time activities and may help in coordinating responses to incidents as they unfold. With the integration of modern technology, surveillance systems can also be linked to alarms or alerts, further bolstering the physical security measures in place.

While the other options mentioned may contribute to the overall security environment in different ways—such as improving employee productivity or protecting digital information—they do not specifically address the enhancement of physical security in a tangible manner like the installation of surveillance cameras does.