When working in an IDLH atmosphere, how is communication maintained? Cuando se trabaja en un ambiente IDLH como se mantiene la comunicación
A. There are no rules to maintained communication in this situation
B. Two workers must remain outside of the IDLH area while one is in the area
C. All workers must remain inside the IDHL area
D. One worker must remain outside of the IDHL area while one is in the area