What is the correct electronic configuration of $Th$ $(Z=90)$?
- A$[Rn] \, 5f^0 \, 6d^2 \, 7s^2$
- B$[Rn] \, 5f^2 \, 6d^2 \, 7s^0$
- C$[Rn] \, 5f^2 \, 6d^0 \, 7s^2$
- D$[Rn] \, 5f^1 \, 6d^2 \, 7s^2$
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