State the location of the $SA$ node and the $AV$ node.
- A$SA$ node - Lower right corner of the right atrium
$AV$ node - Upper left corner of the right atrium - B$SA$ node - Upper left corner of the right atrium
$AV$ node - Lower right corner of the right atrium - C$SA$ node - Lower left corner of the right atrium
$AV$ node - Upper right corner of the right atrium - D$SA$ node - Upper right corner of the right atrium
$AV$ node - Lower left corner of the right atrium
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