यदि $f(9) = 9$ और $f'(9) = 4$ है,तो $\mathop {\lim }\limits_{x \to 9} \frac{{\sqrt {f(x)} - 3}}{{\sqrt x - 3}} = $

  • A
    $2$
  • B
    $4$
  • C
    $-2$
  • D
    $-4$

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