Origin of heart beat and its conduction is represented by

Origin of heart beat and its conduction is represented by
A. Av node `rarr` Bundle of His `rarr` SA node `rarr ` Purkinje fibre
B. SA node `rarr` Purkinje fibres `rarr` AV node `rarr` Bundle of His
C. Purkinje fibres `rarr` AV node `rarr `AV node `rarr `Bundle of His
D. SA node `rarr` AV node `rarr` Bundle of His `rarr` Purkinje fibres

Origin of heart beat and its conduction is represented by

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