Emergency Response Personnel Arrive to the Site of a Collapsed

Emergency response personnel arrive to the site of a collapsed building. There are victims walking away from the building while others are lying on the ground around the perimeter. If implementing reverse triage, which of the following should the emergency personnel do first?

A) Identify one safe location for all ambulatory victims to be assessed and observed.
B) Systematically assess each victim who is lying on the ground and assign a color.
C) Enter the building to locate other victims who might not have been able to leave before the collapse.
D) Transfer the victims on the ground to stretchers and send to the local emergency department.