The NFPA Requires Bulk Oxygen Systems to Be Located

The NFPA requires bulk oxygen systems to be located:
1) 10 feet from flammable gas storage.
2) 10 feet from public sidewalks.
3) 5 feet from the property line.
4) 5 feet from congested areas.

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