In an isolated parallel plate capacitor of capacitance C, the four surface have charges \[{{Q}_{1}}\], \[{{Q}_{2}}\], \[{{Q}_{3}}\] and \[{{Q}_{4}}\] as shown. The potential difference between the plates is [IIT-JEE 1999]

• A.            \[\frac{{{Q}_{1}}+{{Q}_{2}}+{{Q}_{3}}+{{Q}_{4}}}{2C}\]
• B.   \[\frac{{{Q}_{2}}+{{Q}_{3}}}{2C}\]
• C.  \[\frac{{{Q}_{2}}-{{Q}_{3}}}{2C}\]
• D.            \[\frac{{{Q}_{1}}+{{Q}_{4}}}{2C}\]