S1:MV Helper,this is Blue Whale.What is the result of search?Over. S2:MV Blue Whale,this is MV Helper.Sighted a lifeboat in position 47 degrees N 050 degrees W.Over. Q:What's the result of search? A. having located a lifeboat. B. having sighted a lifeboat. C. having launched a lifeboat. D. having sighted a liferaft.