Identify the option showing the correct labeling for $p$,$q$,$r$ and $s$ with reference to the conducting system of the human heart.
- A$p$-Interventricular septum,$q$-$AVN$,$r$-Bundle of His,$s$-$SAN$
- B$p$-$SAN$,$q$-$AVN$,$r$-Bundle of His,$s$-Interventricular septum
- C$p$-$AVN$,$q$-$SAN$,$r$-Interventricular septum,$s$-Bundle of His
- D$p$-Bundle of His,$q$-$SAN$,$r$-Interventricular septum,$s$-$AVN$
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