Which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion,HCOO-? 
Definitions:
Decoding
The process of interpreting and understanding communication symbols and texts, often used in the context of reading and language comprehension.
Partial Report Method
A technique in cognitive psychology where participants are only asked to recall a subset of the stimuli presented, improving recall accuracy.
Sensory Memory
The shortest-term element of memory, which allows individuals to retain impressions of sensory information after the original stimuli have ended.
Sperling's Study
A classic psychological experiment conducted by George Sperling in the 1960s demonstrating the existence of sensory memory by using a grid of letters and a tone signaling which row to recall.
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