Which is the correct route through which...

Which is the correct route through which pulse making, impulse travels in the heart?
(A) SA node - - - - AV node - - - Bundle of His - - - - Purkinje fibres
(B) AV node - - - Bundle of His - - - - SA node - - - Purkinje fibres - - - heart muscles
(C) AV node - - - SA node - - - Purkinje fibres - - - Bundle of His - - - heart muscles
(D) SA node - - - Purkinje fibres - - - Bundle of His - - - AV node - - - heart muscles.

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