What is the correct sequence of the initial treatment for this patient?
a. Start CPR while attaching AED, deliver shock if advised, resume CPR for two mins., check for pulse
b. Check airway, attach AED, perform 2 min. Of CPR, deliver shock if advised, check for pulse resume CPR
c. Start CPR while attaching AED, ventilate twice, deliver shock if advised, resume CPR FOR 2 mins check for pulse
d. Ventilate four times, attach AED,perform 2 min of CPR, deliver shock if advised, check for pulse, resume CPR