As for D/A at 30 days' sight , which of the following is true?
选项：

A:The exporter makes presentation to the importer through the bank of 30days' draft and the shipping documents after the shipment.
B:The exporter releases the documents on the condition that the importer has made acceptance on the draft.
C:The collecting bank will release the documents to the importer after the importer has make the payment at the expiry of the draft.
D:It is applicable only to a 30days' draft that is used in documentary collection In which the collecting bank.