Amelia just saw on the news that Company As first quarter profit is better than investors' expectations. She thinks that she can make a huge gain if she starts to buy Company As shares. If Amelia is wrong, which efficient market hypothesis is observed in this case? (There may be more than one correct answer. You will lose marks by choosing a wrong answer. The minimum mark for the question is zero.)

Select one or more:

a. Strong form

b. Operational efficiency

c. Semi-strong form

d. Informational efficiency

e. Weak form