यदि $f$ एक वास्तविक फलन इस प्रकार है कि $f(4)=4$ और $f^{\prime}(4)=16$,तो $\lim _{x \rightarrow 4} \frac{\sqrt{f(x)}-2}{\sqrt{x}-2} =$

  • A
    $16$
  • B
    $12$
  • C
    $8$
  • D
    $2$

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