Final answer:
A disaster differs from a mass-casualty incident in terms of personal injuries, duration of EMS presence, and declaration requirement by an elected official.
Step-by-step explanation:
A disaster differs from a mass-casualty incident in several ways:
- Disasters may not involve personal injuries, whereas a mass-casualty incident typically involves a large number of people who are injured or killed.
- In a disaster, EMS (Emergency Medical Services) may be on the scene for days or weeks to provide medical assistance and support to affected individuals.
- Only an elected official can declare a disaster, whereas a mass-casualty incident does not require any specific declaration.
Therefore, the correct answer is D. All of the above.