1. $$2\pi \sqrt {\frac{{{\text{gh}}}}{{{\text{k}}{{\text{G}}^2} + {{\text{h}}^2}}}} $$
  2. $$2\pi \sqrt {\frac{{{\text{k}}{{\text{G}}^2} + {{\text{h}}^2}}}{{{\text{gh}}}}} $$
  3. $$\frac{1}{{2\pi }}\sqrt {\frac{{{\text{gh}}}}{{{\text{k}}{{\text{G}}^2} + {{\text{h}}^2}}}} $$
  4. $$\frac{1}{{2\pi }}\sqrt {\frac{{{\text{k}}{{\text{G}}^2} + {{\text{h}}^2}}}{{{\text{gh}}}}} $$
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Answer: Option 3

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