Which term refers to the management of essential functions to ensure system reliability?

The term that best refers to the management of essential functions to ensure system reliability is "Essential Function Management." This concept involves the oversight and management of critical capabilities that are necessary for the proper functioning and integrity of a system. By focusing on essential functions, organizations can prioritize resources and actions that maintain system reliability, ensuring that vital processes continue to operate effectively, even in the face of potential disruptions or threats. This management practice is foundational in cybersecurity, as it aligns with the goal of preserving the availability, integrity, and confidentiality of systems and data.

In comparison, the other terms mentioned may touch on aspects of operational management but do not specifically emphasize the critical nature of functions required for reliability. "Operational Oversight" may suggest a broader scope involving various operational parameters, while "Function Control" and "Capability Management" focus more on managing processes and abilities rather than the specific essential functions that ensure robust system performance.