Which of the Following Statements Are True About the Use

Which of the following statements are true about the use of home care ventilators for delivering noninvasive ventilation (NIV) ?
1) They operate only with pressure triggering.
2) They can operate on AC or DC power sources.
3) They can have a single-limb ventilator circuit.
4) Flow delivery pattern can be adjusted.

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