Which statement is false regarding the GMDSS requirement for ship sources of energy?
A．At all times while the vessel is at sea, a sufficient supply of electrical energy to operate the radio installations and charge any batteries which may be part of the reserve source of energy is required.
B．The reserve sources of energy need to supply Inmarsat-B/F, HF and MF radio installations at the same time.
C．An uninterruptable power supply or other means of ensuring a continuous supply of electrical power to GMDSS equipment that could be affected by normal variations and interruptions of ship's power is required.
D．All of the above.
