Let $r(x)$ be the remainder when the polynomial $x^{135}+x^{125}-x^{115}+x^5+1$ is divided by $x^3-x$. Then,

  • A
    $r(x)$ is the zero polynomial
  • B
    $r(x)$ is a non-zero constant
  • C
    degree of $r(x)$ is one
  • D
    degree of $r(x)$ is two

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