For GMDSS, which statement concerning a compulsory vessel's reserve source of energy is TRUE?

A
It must supply power to GMDSS radio installations and charge any associated batteries.
B
It must not only supply power to GMDSS radio installations and charge any associated batteries, but also provide power for all intraship communications.
C
It must supply power to all survival craft transceivers and associated equipment.
D
It must supply power to associated lighting for a minimum of 12 hours.
E