यदि $a>0$ और $f(x)=\left(\frac{a+x}{1+x}\right)^{a+1+2x}$ है,तो $f^{\prime}(0)=$

  • A
    $a^{a+1}$
  • B
    $a^{a+1}\left\{\frac{1-a^2}{a}+2 \log a\right\}$
  • C
    $2 \log a$
  • D
    $a^{a+1}\left\{\frac{(1+a)^2}{a-2 \log a}\right\}$

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