Which statement is TRUE（）.<br>A:Key letters or abbreviations may not be used in GMDSS radio logbooks under any circumstance<br>B:Urgent communications do not need to be entered in the GMDSS radio log<br>C:Both of the above<br>D:None of the above

Which statement is TRUE（）.
A:Key letters or abbreviations may not be used in GMDSS radio logbooks under any circumstance
B:Urgent communications do not need to be entered in the GMDSS radio log
C:Both of the above
D:None of the above

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