A charged particle q is placed at the center O of cube of length L (A B C D E F G H). Another same charge q is place at a distance L from O. Then the electric flux through ABCD is

• A. \[q/4\pi {{\in }_{0}}L\]              
• B. zero
• C. \[q/2\pi {{\in }_{0}}L\]  
• D.        \[q/3\pi {{\in }_{0}}L\]