What is a common physical barrier used to enhance security?

A common physical barrier used to enhance security is indeed represented by all the options listed. Fencing serves as a significant physical hindrance, preventing unauthorized access to properties and areas that need protection. It establishes a clear boundary and serves as a visual deterrent to potential intruders.

Robust locks are essential as well, providing a physical means to secure doors, gates, and other entry points. They are an integral part of maintaining security in any environment, ensuring that only authorized individuals can gain access.

Alarm systems, while not physical barriers in the traditional sense, play a crucial role in security by alerting individuals to unauthorized access or breaches in security. They can act as a deterrent and also provide a prompt response if a physical barrier has been breached.

Together, these elements form a comprehensive security strategy, relying on both physical barriers and monitoring systems to protect assets and individuals effectively. They work in conjunction to create layers of security that are vital for effective security planning.