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5. Based on the window event test of efficient market hypothesis: (2 points) If investors cannot make abnormal returns around the dividend announcement date, then the market is efficient at the semi-strong form but inefficient at the weak form. If investors cannot make abnormal returns around the dividend announcement date, then the market is efficient at the semi-strong form and efficient at the weak form. If investors cannot make abnormal returns around the dividend announcement date, then the market is inefficient at the semi-strong form but efficient at the weak form. If investors cannot make abnormal returns around the dividend announcement date, then the market is inefficient at the semi-strong form and inefficient at the weak form. None of the above