The action that the 2-rescuer supports is option B. Alternating the compressor role every 2 minutes.
CPR stands for cardiopulmonary resuscitation. It is a technique that allows anyone to save a life when someone has a cardiac arrest.
Rescuer number 2 has to give chest compressions to the victim alternating every 2 minutes with the first rescuer or when the first one gets tired. The aim of the alternation is:
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