A solid sphere is made by three materials taken as shown. total charge on system is Q. if magnitude of the electric field intensity at every boundary point is same then choose the correct option

A) Ratio of charges in material 1, material 2, material 3 is 1:3:5

B) Charge density of material 1 will be Q/12πr³

C) Electric field at a distance r/2 from center will be Q/72πε₀ r²

D) Electric field at a distance r/2 from center will be Q/36πε₀ r² 

3r P, 2r P: