Atoms form two types of bonds. Which describes these bonds?

A.
In a covalent bond, valence electrons are shared; in an ionic bond, valence electrons are transferred.

B.
In a covalent bond, valence electrons are transferred; in an ionic bond, valence electrons are shared.

C.
In a covalent bond, outer electron orbitals are shared; in an ionic bond, outer electron orbitals are transferred.

D.
In a covalent bond, outer electron orbitals are transferred; in an ionic bond, outer electron orbitals are shared.