Detailed Instructions: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Q: Question: Defibrillation is characterized by:
Options: <1> It requires the patient's previous sedation. <2> It is usually used when the patient is in asystole. <3> It can be applied in ventricular tachycardias with a pulse. <4> The discharge is not synchronized with the patient's heart rate. <5> A minimum intensity discharge should be used.
A:
4