In the first configuration (1) as shown in the figure, four identical charges \(\left(q_0\right)\) are kept at the corners \(A, B, C\) and \(D\) of square of side length 'a'. In the second configuration (2), the same charges are shifted to mid points \(\mathrm{G}, \mathrm{E}, \mathrm{H}\) and F, of the square, If \(\mathrm{K}=\frac{1}{4 \pi \varepsilon_0}\), the difference between the potential energies of configuration (2) and (1) is given by :

1. A \(\frac{K q_0^2}{\mathrm{a}}(4-2 \sqrt{2})\)
2. B \(\frac{K q_0^2}{\mathrm{a}}(3-\sqrt{2})\)
3. C \(\frac{\mathrm{Kq}_0^2}{\mathrm{a}}(4 \sqrt{2}-2)\)
4. D \(\frac{\mathrm{Kq}_0^2}{\mathrm{a}}(3 \sqrt{2}-2)\)