What's the correct procedure of using a Bill of Exchange in payment
A．Present the shipping documents to the bank, get a Bill of Lading, transport the goods.
B．Transport the goods, presenting the Bill of Lading to the bank, get a Bill of Exchange.
C．Write a Bill of Exchange, get the Bill of Lading, transport the goods, present the shipping documents to the bank.
D．Get the Bill of Lading at first after transporting the goods, then write a Bill of Exchange, finally present the shipping documents to the bank.