A charged shell of radius R carries a total charge Q. Given `phi` as the flux of electric field through a closed cylindrical surface of height h, radius r & with its centre same as that of the shell. Here centre of cylinder is a point on the axis of the cylinder which is equidistant from its top & bottom surfaces. which of the followintg are correct.

Options

A. If `h gt 2R` and `r gt R` then `Phi = Q//in_(0)`
B. If `h lt 8R//5` and `r=3R//5` then `Phi=0`
C. If `h gt 2R` and `r=3R//5` then `Phi = Q//5in_(0)`
D. If `h to 2R` and `r=4R//5` then `Phi = Q//5in_(0)`