A MODU must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement, you may use _______.

A
a gas mask certified by the Mine Safety and Health Administration
B
the same self-contained breathing apparatus required with the fireman's outfit
C
an oxygen breathing apparatus, provided that the device has been inspected within three years
D
a portable ventilation system that will provide a complete change of air every three minutes
E