93. 信用狀有關提單之敘述為「FULL SET OF CLEAN ON BOARD OCEAN BILLS OF LADING MADE OUT TO ORDE R OF SHIPPER MARKED“FREIGHT PREPAID”」，受益人押匯時必須提示何種提單？(A)全套、清潔及記名式提單(B)備運、清潔及指示式提單(C)全套、運費預付及指示式提單(D)清潔、運費到付及指示式提單。