Ans. B. Chest compression at least 5 cm/2 inchBasic life suppo (BLS), advanced cardiovascular life suppo (ACLS), and post-cardiac arrest care all describe a set of skills and knowledge applied sequentially during the treatment of patients who have a cardiac arrest.ACLS comprises the level of care between BLS and post-cardiac arrest careUpdate recommendations for advanced cardiac life suppo 2015:The combined use vasopressin and epinephrine offers no advantage to using standard-dose epinephrine in cardiac arrest.Vasopressin has been removed from the Adult Cardiac Arrest Algorithm-2015 update.Advanced Cardiac Life Suppo:Continuous chest compressions at a rate of lil)/rnin to 120/min, vnthout pauses for ventilation. The provider delivering ventilation should provide 1 breath every 6 seconds (10 breaths per minute).It may be reasonable to avoid and immediate$r correct hypotension (SBp < 90 mm Hg, MAp < 65 mmHg) during post-cardiac arrest care.