यदि $f(9)=9$ और $f^{\prime}(9)=4$ है,तो $\lim _{x \rightarrow 9} \frac{\sqrt{f(x)}-3}{\sqrt{x}-3}=$

  • A
    $2$
  • B
    $3$
  • C
    $9$
  • D
    $4$

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