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/C③70% Sight L/C + 30% D/P④ 30% CWO + 70% Sight L/C⑤ 100% O/A(A)④② ③⑤①(B)④② ③① ⑤(C)②④ ③① ⑤ (D)④②①③⑤