An animal shelter is under a mandatory evacuation order due to an approaching wildfire. Of the following, what is the MOST critical first step in the shelter's emergency response?
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A
Activating the pre-established communication tree to notify all staff and volunteers.
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B
Posting on social media to find emergency foster homes for all animals.
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C
Beginning to load animals into transport vehicles immediately.
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D
Contacting receiving shelters to confirm capacity and arrangements for intake.