International SafetyNet and Navtex Services promulgate MSI by means of（）.<br>A:FEC and ARQ<br>B:satellite and terrestrial communications<br>C:radio and telex<br>D:NBDP

International SafetyNet and Navtex Services promulgate MSI by means of（）.
A:FEC and ARQ
B:satellite and terrestrial communications
C:radio and telex
D:NBDP

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