Q: 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'.
Question: Peritoneal dialysis is a depurative technique that is characterized because:
Options: <1> It is necessary to always administer heparin through the peritoneal catheter. <2> It is indicated in patients with respiratory problems of a restrictive type. <3> Does not produce significant hemodynamic alterations. <4> Requires daily and nightly solution exchanges every four hours. <5> Water and toxic substances are eliminated by ultrafiltration.
A:
3