Studies from which form(s) of the efficient market hypothesis (EMH) provide evidence that security prices adjust so quickly to a public announcement that it is not possible for investors to realize significant abnormal returns after a public announcement has been made()

A. semip-form of the EMH.

B. weak-form of the EMH

C. p-form of the EMH

数据库设计包括两个方面的设计内容，它们是

A．概念设计和逻辑设计

B．模式设计和内模式设计

C．内模式设计和物理设计

D．结构特性设计和行为特性设计