Which of the following statements regarding ventricular fibrillation (v-fib) is correct?

a: loss of consciousness occurs within minutes after the onset of v-fib.
b: any patient in v-fib must receive cpr for 2 minutes prior to defibrillation.
c: patients in v-fib should be defibrillated after every 60 seconds of cpr.
d: in v-fib, the heart is not pumping any blood and the patient is pulseless.