यदि $y = \frac{1}{a^{1-\log _{a} x}}$,$z = \frac{1}{a^{1-\log _{a} y}}$ और $x = a^{k}$ है,तो $k =$

  • A
    $\frac{1}{a^{1-\log _{a} z}}$
  • B
    $\frac{1}{1-\log _{a} z}$
  • C
    $\frac{1}{1+\log _{z} a}$
  • D
    $\frac{1}{1-\log _{z} a}$

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