Identical charges \[(-q)\] are placed at each corners of a cube of side b, then the electrostatic potential energy of charge \[(+q)\] placed at the centre of the cube will be:

• A. \[-\frac{4\sqrt{2}{{q}^{2}}}{\pi {{\varepsilon }_{0}}}\]
• B. \[\frac{8\sqrt{2}{{q}^{2}}}{\pi {{\varepsilon }_{0}}b}\]
• C. \[-\frac{4{{q}^{2}}}{\sqrt{3}\pi {{\varepsilon }_{0}}b}\]
• D. \[\frac{8\sqrt{2}{{q}^{2}}}{4\pi {{\varepsilon }_{0}}b}\]