A cargo boom is a（）.<br>A:double sized mattress consists of more than 890 coils<br>B:spar extending from a mast or a king post<br>C:flap（Becker rudder）can be fitted to the rudder’s trailing edge<br>D:bridle arrangement having a long beam of the length of the container

A cargo boom is a（）.
A:double sized mattress consists of more than 890 coils
B:spar extending from a mast or a king post
C:flap（Becker rudder）can be fitted to the rudder’s trailing edge
D:bridle arrangement having a long beam of the length of the container

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