下列有关签订订货合同的说法不正确的是（）。

A．对于重要的设备，最好与一个总厂厂商签订合同，不要分散签订

B．对长时间使用的大宗材料，最好与几家供货厂商签定连续供货和定期结算的合同

C．因为用量小，所示不必担心零星物资的供应

D．与工程合同相比，货物合同还包括产品检验、测试方法与时间等特殊内容

David Beckham, CFA, is a portfolio manager at a hedge fund company. David has an arrangement with a close friend who is an investment consultant, whereby he refers clients who need investment advice to the friend, who in turn refers clients to Beckham. Beckham believes there is no referral fees involved, and he does not disclose this arrangement to his existing or prospective clients. Has Beckham most likely violated the Standards（）

A. No.

B. Yes, only by failing to disclose the arrangement to his prospective clients.

C. Yes, both by failing to disclose the arrangement to his existing clients and to his prospective clients.