The diagram presents a family tree, with the blood groups of certain individuals marked. What blood groups could the numbered individuals have?
- A1 A, 2 B, 3 A, 4 A, 5 B, 6 B
- B1 A, 2 B, 3 A, 4 B, 5 AB, 6 O
- C1 AB, 2 O, 3 A, 4 A, 5 B, 6 B
- D1 AB, 2 O, 3 A, 4 B, 5 AB, 6 O