In order to complete an important task, a certain unit decided to select a capable team to form a working group. After careful consideration, the leader decided to: at least one of the two members of the group A and B; the group of at most one of the two members Choose one person; (3) If Ding is selected, then both C and E are indispensable; ⑷ The group members must include the 4 mentioned above. Based on this, it is possible to introduce a person who is unlikely to be selected? ['A.', 'B.', 'Ding.', 'C.']