The SARS (severe acute respiratory syndrome) outbreak was an epidemic that spread over several countries. Which of the following terms describes what happened?

A. Holoendemic: Refers to a condition that is consistently present at a high rate in a population, typically affecting most children (e.g., malaria in some regions). Not applicable to SARS. B. Mixed outbreak: This refers to an outbreak with multiple sources or modes of transmission, not widespread international transmission. C. Hyperendemic: Refers to a persistently high prevalence of a disease within a certain area - not international spread. D. Pandemic: A pandemic is a worldwide or multi-country epidemic - accurately describing how SARS spread across continents.