Which Sequence Does the Electrical Stimulus of the Cardiac Cycle $\rightarrow$

Which sequence does the electrical stimulus of the cardiac cycle follow?

A) AV node $\rightarrow$ SA node $\rightarrow$ bundle of His
B) Bundle of His $\rightarrow$ AV node $\rightarrow$ SA node
C) SA node $\rightarrow$ AV node $\rightarrow$ bundle of His $\rightarrow$ bundle branches
D) AV node $\rightarrow$ SA node $\rightarrow$ bundle of His $\rightarrow$ bundle branches