ABCD is a square of side Length l and O is its centre. The line OP is perpendicular to the plane of the square and OP= l/2. A point charge Q is placed at point P. Then electric flux through the square ABCD is 

 

 

• A

  $\frac{Q}{{\epsilon }_0}$

• B

  $\frac{Q}{4{\epsilon }_0}$

• C

  $\frac{Q}{8{\epsilon }_0}$

• D

  $\frac{Q}{6{\epsilon }_0}$