यदि $f(x)=|x-5|+|x+5|+|x-4|+|x+4|$ है,तो $\frac{f^{\prime}(1)-f^{\prime}(-6)}{f^{\prime}(-1)+f^{\prime}(6)}=$

  • A
    $1$
  • B
    $0$
  • C
    $4/5$
  • D
    $3/2$

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