What Government Programs Can Serve as a Source for Reimbursement

What government programs can serve as a source for reimbursement for pulmonary rehabilitation?
1) Prospective payment system (PPS)
2) Comprehensive outpatient rehabilitative facility (CORF)
3) Veterans Administration benefits
4) Civilian Health and Medical Programs of the Uniformed Services (CHAMPUS)

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