Characteristics Common to Most Positive Pressure Ventilation Designed for Use

Characteristics common to most positive pressure ventilation designed for use in the home setting include which of the following?
1) Volume cycling to end inspiration
2) High-pressure pneumatic power source
3) Backup internal power supply
4) Rotary piston drive mechanism

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