Correct Answer – 1
In piezoelectric, dipoles align themselves (on application of a mechanical streets or an electric field) in an ordered manner so that there is a net dipole moment.
Ferroelectrics are those piezoelectrics in which dipoles are grounded in domains button applying an electric field the domains align themselves in such a way that alternatively they point up and down so that thge crystals do not posses any net dipole moment.