[单选题]When should the buyers open a letter of credit in a transaction?
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2023-09-29 20:10:47
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[单选题]When should the buyers open a letter of credit in a transaction?

A.before contract or confirmation is signed by buyers and sellers
B.when the buyers want to open a letter of credit
C.when the buyers and sellers finished the transaction
D.after contract or confirmation is signed.
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