Answer:(a) only inside the shell.
Explanation:An electric field is the area surrounding an electric charge,it exerts force on the charges present with the field creating the force of repulsion or attraction,when positive charge is involved the Field is radiated outward while when a negative charge is involved the Field is radiated inwards.
The electric field due to uniformly distributed change inside a sphere is usually Zero due to any excess charge is outside the shell and it is given by the equation E = kQ/r2.