What term describes the critical functions that must continue or resume quickly after a disruption in normal operations?

The term that describes the critical functions that must continue or resume quickly after a disruption in normal operations is Mission Essential Functions (MEFs). MEFs refer specifically to those activities that are vital for maintaining an organization's operational integrity, even in the face of unforeseen disruptions such as natural disasters, cyberattacks, or other emergencies.

Identifying MEFs is crucial for effective business continuity and disaster recovery planning. It allows organizations to prioritize resources and efforts to ensure that the most important functions are restored or sustained first. This focus helps minimize the impact on overall operations and supports the organization’s resilience in the face of challenges.

In contrast, the other options relate to different aspects of security and operational management. Recovery Service Level (RSL) typically pertains to the expectations set for recovery efforts, while Incident Response refers to the processes and procedures for addressing security incidents. The Cyber Security Incident Response Team (CSIRT) is a specific group designated to handle cybersecurity incidents. Although all these elements are important in the broader context of security and operations, they do not specifically encapsulate the idea of critical functions that must be prioritized during disruptions as effectively as MEFs do.