题目：
Which of the following statements about Standard Ⅵ (C), Referral Fees, is TRUE（）
A. Referral fees must be disclosed after proceeding with an agreement for service.
B. Referral fees may be disclosed before or after proceeding with an agreement for service.
C. Referral fees must be disclosed before proceeding with an agreement for service.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：解析：企业应该选择放弃享受现金折扣的方案，因为投资收益率高于放弃现金折扣的成本，即对企业最有利付款期是60天。
