45 對出口商而言，下列付款方式安全性由大至小的排序為何？① 70% Usance L/C + 30% D/A② 100% Sight L/C ③70% Sight L/C + 30% D/P④ 30% CWO + 70% Sight L/C ⑤ 100% O/A (A)④② ③⑤①(B)④② ③① ⑤ (C)②④ ③① ⑤ (D)④②①③⑤