Durable Medical Equipment (DME) Companies Usually Provide Which of the Following

Durable medical equipment (DME) companies usually provide which of the following respiratory home care services?
1) Third-party insurance processing
2) Most respiratory care modalities
3) 24-hr/7-days-a-week service
4) Home instruction and follow-up

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