Advantages of Home Liquid O₂ Systems Include Which of the Following

Multiple Choice

Advantages of home liquid O₂ systems include which of the following?
1) Usually include a small refillable portable subsystem.
2) Do not require an O₂ service delivery company.
3) Provide large-volume O₂ storage in a small space.
4) Are useful for rehabilitation activities (e.g., walking) .

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