Final answer:
The job of security in regards to the physical environment involves observing the physical elements, detecting changes and hazards, and reporting the observable.
Step-by-step explanation:
The job of security in regards to the physical environment involves all of the options mentioned - observing the physical elements, detecting changes and hazards, and reporting the observable. Security personnel are responsible for monitoring the environment, including entrances, exits, and other areas, to ensure safety and prevent any potential risks or threats. For example, they may observe surveillance footage, patrol the premises, or conduct inspections to identify and report any suspicious or dangerous activities or conditions. By doing so, security plays a crucial role in maintaining a secure and safe physical environment.