What It the Main Difference Between an Ionic and a Covalent

Multiple Choice

What it the main difference between an ionic and a covalent bond?

A) One is the sharing of a pair of electrons,the other is the transfer of at least one electron.
B) One involves electrons,the other does not involve any electrons.
C) The electrons in both types of bonding undergo an exchange.
D) The electrons are traded between the two atoms and this keeps the atoms close.
E) Both bonds are the same,but named different to describe different atoms involved.