Consider the following types of information. If this information is immediately and fully reflected in security prices, what form of market efficiency is implied?
a. A company's recent quarterly earnings announcement.
b. Historical bond yields.
c. Deliberations of a company's board of directors concerning a possible merger with another company.
d. Limit orders in a specialist's book.
e. A brokerage firm's published research report on a particular company.
f. Movements in the Dow Jones Industrial Average as plotted in The Wall Street Journal.