Whichofthefollowingcanbestsummarizethemainideaofthepassage?
A.WithnoRetr iever,thousandsoflaptopsarestoleneveryyear.
B.Anewsoftwareprovidesameanstoreducelaptoptheft.
C.Retr ieverhashelpedtofindthievesandlostcomputers.
D.Anewprogramoffersacommunicationplatform.withthethief.
正确答案：B
