Which of these statements correctly describes the use of formal charge in choosing between possible lewis structures to describe a molecule?

i. formal charge on all the atoms should be zero, or at least the smallest possible value.
ii. he sum of the formal charges on all the atoms should equal the charge on the molecule or ion.
ill. the formal charge on an atom is not affected by the of the atom. nitrogen will containing nitrogen and oxygen, the lewis structures with a charge on the
iv. contribute the most to the description of the bonding.

a. ii and iii only
b. ii and iv only
c. i and iii only
d. iii and iv only
e. i and ii only