A charge \'q\' is placed at the centre of a conducting spherical shell of radius R, which is given a

A charge \'q\' is placed at the centre of a conducting spherical shell of radius R, which is given a charge Q. An external charge Q\' is also present at distance `R\' (R\' gt R)` from \'q\'. Then the resultant field will be best represented for region `r lt R` by : [where r is the distance of the point from q]