The ratio of the slant height and the height of a cone is 4 : 3. If the curved surface area of the cone is \(4 \sqrt{7} \pi\) square units, then the radius of the cone is _________ units.

1
7
2
\(7 \sqrt{7}\)
3
\(\frac{\sqrt{7}}{7}\)
4
\(\sqrt{7}\)

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