Final answer:
The security concept described is separation of duties, a principle that prevents fraud by dividing critical tasks among different individuals. Even if it seems practical for the hostess to deliver food when it's busy, a clear division of labor is established for reasons of accountability and safety.
Step-by-step explanation:
The concept being described is separation of duties, which is a foundational element in internal control systems designed to prevent fraud and errors. This is most applicable in fields like cybersecurity and accounting, where such a division is crucial for ensuring that no single individual has enough control over a process to subvert it for fraudulent purposes.
In the context given, a clear division of labor is exemplified by individuals having specialized tasks. Considering the restaurant scenario, it might seem efficient for the hostess to assist with delivering food when necessary. However, organizations generally decide on divisions of labor based on various factors, including maintaining standards of quality, accountability, and safety. There may be reasons why it's not part of the hostess's duties to deliver food, even if it seems like a smart division of labor from an outsider's viewpoint.