Successful Tube Passage Through the Larynx During Blind Nasotracheal Intubation

Successful tube passage through the larynx during blind nasotracheal intubation is indicated by which of the following?
1) Louder breath sounds
2) Harsh cough
3) Vocal silence

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3