Documented market anomalies include all of the following EXCEPT:（）

A. the greater the ratio of book value/market value, the greater the risk-adjusted rate of return.

B. low P/E ratio stocks experience superior results to the market.

C. the ability for an investor to profit by buying stocks on Friday and selling them on Monday.

在关系数据库设计理论中，如果一个关系R满足1NF，但R的某个非码属性传递函数依赖于码，则关系R至多属于

A．1NF

B．2NF

C．3NF

D．BCNF