If the areas of two similar triangle are in the ratio 5 : 7, then what is the ratio of the corresponding sides of these two triangles?

If the areas of two similar triangle are in the ratio 5 : 7, then what is the ratio of the corresponding sides of these two triangles?
1). 5:7
2). 25:49
3). $\sqrt{5}$ : $\sqrt{7}$
4). 125:343

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