Let $S=\left\{ x : x \in R \text { and }(\sqrt{3}+\sqrt{2})^{ x ^2-4}+(\sqrt{3}-\sqrt{2})^{ x ^2-4}=10\right\} \text {. }$ Then $n ( S )$ is equal to

  • [JEE MAIN 2023]
  • A

    $2$

  • B

    $4$

  • C

    $6$

  • D

    $0$

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