Match List-I with List-II and select the correct option: 
The bond angles \( b_1, b_2, b_3 \) in the above structure are respectively in \( ^\circ \):



In the first configuration (1) as shown in the figure, four identical charges \( q_0 \) 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 C, E, H, and F of the square. If \( K = \frac{1}{4\pi \epsilon_0} \), the difference between the potential energies of configuration (2) and (1) is given by: