Equal charges `q` are placed at the four corners `A,B,C,D`of a square of length `a`. The magnitude of the force on the charge at `B` will be
A. `(3q^(2))/(4piepsilon_(0)a^(2))`
B. `(4q^(2))/(4piepsilon_(0)a^(2))`
C. `((1+2sqrt(2))/(2))(q^(2))/(4piepsilon_(0)a^(2))`
D. `(2+(1)/(sqrt(2)))(q^(2))/(4piepsilon_(0)a^(2))`