Which of the Following Are True About the FET

Which of the following are true about the FET?
1) It causes less bronchiolar collapse than traditional coughing.
2) It occurs from mid to low lung volume without glottis closure.
3) It has a period of diaphragmatic breathing and relaxation.
4) It occurs from mid to high lung volume without glottis closure.

A) 1 and 3 only
B) 1, 2, and 3 only
C) 3 and 4 only
D) 2, 3, and 4 only