单选题An SES operator can chose the most suitable CESs according to（）.Athe routing agreement for a particular ocean regionBThe communication service he requiredCthe positions of his ship and the CESsDB and C
单选题
An SES operator can chose the most suitable CESs according to（）.
A
the routing agreement for a particular ocean region
B
The communication service he required
C
the positions of his ship and the CESs
D
B and C
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