A unit seeks external cooperation and is ready to determine one or more partners in the four units of A. B, C, and D. After careful investigation and discussion, the unit management finally formed the following three opinions: (1) For A and Choose two units at most. (2) For units A and D, choose at least one. (3) If you choose units C or D, you cannot choose unit B. In the final decision, the unit leader only adopted the above one. Opinions. Based on the above statement, which of the following best meets the final decision of the unit leader? ['Choose B, C, D.', 'Choose B, but not C and D.', 'Choose A. B, D.', 'Choose C, but not B and D.']