The ratio of the ages of A and B, four years ago, was 4 ∶ 5. Eight years hence, the ratio of the ages of A and B will be 11 ∶ 13. What is the ratio of their present ages? 

1
7 ∶ 8
2
8 ∶ 7
3
11 ∶ 9
4
9 ∶ 11

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