While underway and towing an unmanned tank barge you are required to（）.<br>A:maintain a strict watch on the barge from the towing vessel<br>B:fly a red flag from the towing vessel<br>C:open the tops of all empty tanks on the barge<br>D:take hourly soundings of any loaded tanks on the barge

While underway and towing an unmanned tank barge you are required to（）.
A:maintain a strict watch on the barge from the towing vessel
B:fly a red flag from the towing vessel
C:open the tops of all empty tanks on the barge
D:take hourly soundings of any loaded tanks on the barge

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