On Arriving at a Mass Causality Scene,health Care Providers Using

On arriving at a mass causality scene,health care providers using the START approach will initiate triage by doing which of the following first?

A) Assess breathing.
B) Instruct ambulatory patients to move to a designated area.
C) Assess respiratory rate,perfusion,and mental status.
D) Differentiate between those triaged as red and yellow.