A certain unit must select 3 of the 6 staff members A. B, C, D, E, and F to participate in the provincial vocational skills competition. Four judges have put forward their own opinions: (1) At least two of A and C Choose one person; (2) at least one of B and E; (3) at most one of B and C; (4) at least one of two and D. It was later learned that E could not be due to illness Participated, and the opinions of the four judges mentioned above were respected. Based on the above information, which of the following are contestants selected by this unit? ['A. B, C.', 'A. B, D.', 'A. B, F.', 'C, D, F.']