The treatment of tracheo-esophageal fistulas, which are a pathological connection between tracheal and esophageal lumena through an epithelium-covered canal, is very difficult and marked by numerous failures. Indicate the methods used for the treatment of tracheo-esophageal fistulas:

1) placing a tube into the stomach or intestine and conducting enteral nutrition;
2) placing a permanent self-expanding esophageal stent;
3) placing a temporary self-expanding stent in the trachea and esophagus;
4) attempts to close the fistula canal by means of repetitive ablation, biological glues and obliteration;
5) excision of the fistula with a segmental resection of the trachea and a primary esophageal sewage strengthened with a pedunculated tissue flap taken from the neighbourhood.
The correct answer is: