A shell made of a conductor has inner radius a and outer radius b. and it carries charge Q. A dipole of dipole moment P→ is placed at its centre. Choose the correct alternative:

(i) Electric field outside sphere does not depends on inside charge, it depends on only outer charge.(ii) Surface charge density on inner surface is non-uniform and zero.(iii) Surface charge density on outer surface is non-uniform and zero,(iv) Surface charge density on outer surface does not depend on |P¯|