What features do all the resonance forms of a molecules or ion have in common? Choose all

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Question:

What features do all the resonance forms of a molecules or ion have in common? Choose all that apply.
a) arrangement of electrons
b) formal charge on each atom
c) net charge on the molecule or ion
d) arrangment of atoms
e) none of these are common between resonance forms
f) atoms present
g) number of electrons