A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square is [MP PMT 1997; AMU 1999]

• A.            \[\frac{q}{{{\varepsilon }_{0}}}\]                                    
• B.            \[\frac{q}{\pi {{\varepsilon }_{0}}}\]
• C.                    \[\frac{q}{4{{\varepsilon }_{0}}}\]                          
• D.            \[\frac{q}{6{{\varepsilon }_{0}}}\]