A company discusses the necessity of establishing branches in A. B, C, D. A said: "The branch should be established in A or D. " B said: "I do not agree to establish in A. D. "Branch. " C said, "I found after investigation that it was a very unwise idea to establish a branch at A. " Later, it turned out that A. B, and C all were right. Based on this, where should the branch company be built? ['D or B.', 'A or C.', 'D and C.', 'A or B.']