Which of the following pairs of structures represent resonance forms, and which do not?

	Pair (a) represents resonance forms.
	Pair (b) represents resonance forms.
	Pair (c) represents resonance forms.
	Pairs (a) and (b) represent resonance forms.
	Pairs (a) and (c) represent resonance forms.
	There are no pairs representing resonanse forms.

Could you break it down stepS for me to understand how arrive to the conclusion, including clear formulas. NOt just summarizing it. Would be helpful if you break it down in detain as I would like to understand it. Thanks. Make it a clear formula