Identify the option showing the correct labeling for $p, q, r$ and $s$ with reference to the conducting system of the human heart.

Question

p - Bundle of His, q - SAN, r - Interventricular, s - AVN

p - SAN, q - AVN, r - Bundle of His, s - Interventricular septum

p - Interventricular septum, q - AVN, r - Bundle of His, s - SAN

p - AVN, q - SAN, r - Interventricular septum, s - Bundle of His

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