40F4 A
 Aboard ship, SafetyNETTM messages can be received by which equipment/methods?
A. EGC receiver of the vessel's Inmarsat-C SES. 
B. VHF DSC on the weather channels.
C. NAVTEX Receiver on 518 kHz or the Tropical Navtex frequency
D. HF SITOR (NBDP) MSI frequencies.
