Final answer:
The warning sign indicating the use of cameras serves as a deterrent to prevent unauthorized access and theft of company assets by making individuals aware that their actions are being monitored.
Step-by-step explanation:
The control objective of the observed sign warning about camera usage aims to deter unauthorized access or inappropriate behaviors by informing potential intruders that surveillance is in place. This type of preventive measure is used as a part of a company's physical security controls, which are designed to protect assets, including sensitive information and physical devices like USB flash drives, from theft or misuse. The presence of the sign can serve as an effective deterrent, implying that any unauthorized actions will be recorded and could lead to disciplinary actions or legal consequences.