Four equal charges \[Q\] are placed at the four corners of a square of each side is \['a'\]. Work done in removing a charge ? Q from its centre to infinity is [AIIMS 1995]

• A.                    0                                        
• B.                    \[\frac{\sqrt{2}{{Q}^{2}}}{4\pi {{\varepsilon }_{0}}a}\]
• C.                                                               \[\frac{\sqrt{2}{{Q}^{2}}}{\pi {{\varepsilon }_{0}}a}\]
• D.                                                 \[\frac{{{Q}^{2}}}{2\pi {{\varepsilon }_{0}}a}\]