Which of the following definitions is incorrect?

Rationale: A. External disasters are incidents that happen outside the hospital or healthcare campus, such as natural disasters (e.g., earthquakes, hurricanes), transportation accidents, industrial accidents, or acts of terrorism. These events require hospitals to respond by activating emergency plans to treat incoming patients and allocate resources appropriately. B. Internal disasters originate within the hospital itself and can disrupt operations. Examples include fires, chemical spills, structural damage, equipment failure, or power outages. Internal disaster plans focus on staff safety, evacuation procedures, and maintaining patient care during facility emergencies. C. A mass casualty incident (MCI) occurs when the number of casualties exceeds the immediate capacity of local medical facilities, requiring triage, prioritization of care, and sometimes external assistance from other hospitals, emergency medical services, or disaster response teams. D. Multi-casualty incidents (MCIts) involve multiple patients but generally remain within the hospital’s capacity to manage. Unlike mass casualty incidents, where local resources are overwhelmed, multi-casualty events can usually be handled with existing staff, supplies, and facilities. Hospitals often activate standard emergency procedures but do not require external support to manage patient care. Therefore, this definition misrepresents the distinction between multi-casualty and mass casualty disasters.