Cardiopulmonary resuscitation is a first aid technique for individuals in cardiac arrest that involves
a. a defibrillator and rescue breathing
b. rescue breathing and chest compressions
c. a defibrillator and chest compressions
d. chest compressions and adrenaline injections

Correct option choice is :

B) rescue breathing and chest compression

Explanation:

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the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.