单选题However, reception of certain types of MSI messages, such as shore to ship distress alerts and navigational and meteorological warning are（）.Aselective and can be suppressed by shipsBmandatory and can not be suppressed by ships in the affected areaCnot very important so that ships don‟t require themDreceived by all ships wherever they are
单选题
However, reception of certain types of MSI messages, such as shore to ship distress alerts and navigational and meteorological warning are（）.
A
selective and can be suppressed by ships
B
mandatory and can not be suppressed by ships in the affected area
C
not very important so that ships don‟t require them
D
received by all ships wherever they are
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