Indications for Delivering Sigh Breaths During Mechanical Ventilation Include Which

Multiple Choice

Indications for delivering sigh breaths during mechanical ventilation include which of the following?
1) Before and after suctioning
2) During chest physical therapy
3) In patients with stiff lungs
4) When small V_T values are used

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