Select the correct option:
$(1)$ The pericardium is a double-layered membrane surrounding the heart.
$(2)$ The $SA$ node has a higher rate of impulse generation compared to the $AV$ node.
$(1)$ The pericardium is a double-layered membrane surrounding the heart.
$(2)$ The $SA$ node has a higher rate of impulse generation compared to the $AV$ node.
- AOnly $(1)$ is correct.
- BOnly $(2)$ is correct.
- CBoth $(1)$ and $(2)$ are correct.
- DBoth $(1)$ and $(2)$ are incorrect.
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