Beatrice believes that the company's CFO, Bradley, knew about the acquisition plan before it was announced to the public and makes a lot of personal gain by trading shares. If Beatrice is right, 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. Operational efficiency b. Strong form c. Financial efficiency d. Semi-strong form e. Weak form