问题详情

According to the passage, which of the following statements is correct？
A．A "revocable credit" may be cancelled at any time.
B．The credits are usually in favor of the exporter.
C．An "irrevocable credit" may not be amended.
D．The credits are usually in favor of the importer.请帮忙给出正确答案和分析，谢谢！