The radii of two cylinders A and B are in the ratio of 4 ∶ 7 and the heights are in the ratio of 7 ∶ 5  respectively. Find the ratio of curved surface area of cylinder B to that of A. 

1
5 ∶ 4
2
49 ∶ 35
3
6 ∶ 5 
4
35 ∶ 49 

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