What is the main difference between ionic and covalent bonds?

A$)$ Ionic bonds involve sharing of electrons, while covalent bonds involve transfer of electrons.

B$)$ Ionic bonds form between metals and nonmetals, while covalent bonds form between nonmetals.

C$)$ Ionic bonds are weaker than covalent bonds.

D$)$ Covalent bonds result in the formation of ions, while ionic bonds do not.