To establish a communication channel for the telex service in the INMARSAT-Aterminal, you should first（）.
A. establish a communication channel from the CES, via the International Telex Network to the final destination
B. set up a communication channel from your SES, via a satellite, to a CES within your ocean region
C. set up a channel directly to the addressee at the destination
D. establish a channel from your terminal , via the International Telex Network to a CES within your ocean regio
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