If $n = 7 + 4 \sqrt{3}$,then the value of $\left(\sqrt{n} + \frac{1}{\sqrt{n}}\right)$ is

  • A
    $2 \sqrt{3}$
  • B
    $4$
  • C
    $-4$
  • D
    $-2 \sqrt{3}$

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