Which of the following is a correct resonance structure of A? 
Definitions:
Arrhythmia
Without rhythm; irregularity.
Heart's Rhythm
Refers to the pattern of beats made by the heart, indicative of its electrical activity and health.
AC Interference
Electromagnetic interference in electrical circuits caused by alternating current (AC), potentially distorting or interrupting signals.
Arrhythmia
A medical condition characterized by an irregular heartbeat.
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