A square of side 20 cm is enclosed within a sphere of radius 80 cm . Centres of the sphere and the square coincide at a common point . There are four charges of `2xx10 ^(-6 ) C. -5xx 10 ^(-6 ) , C .-3xx 10 ^(-6 ) C and 6xx10 ^(-6) C ` at the four corners of the square . the electric flux passing through the surface of the sphere in `N .m ^(2) //C.`

Options

A. `16pi xx 10^(-6)`
B. zero
C. `8 pi xx 10 ^(-6)`
D. `36 pi xx 10 ^(-6) `