Find the square root of \(\sqrt {\left[ {15{\rm{}} + {\rm{}}2\left( {\sqrt {15} - \sqrt {21} - \sqrt {35} } \right)} \right]} \).

1
√5 – √3 – √7
2
√5 + √3 + √7
3
√5 – √3 + √7
4
√5 + √3 – √7

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